If flame drops on stove this shows it is possibly a gas supply issue) Is there enough water flowing? This seemed very odd, because the whole point of a combie is that it only heats up the hot water when you need it. Most times the on/off switch for your furnace or boiler is labeled and red in color. I have a burnham v84 oil boiler for baseboard heating and hot water. If you use the timer on your boiler, make sure that the clock is set to the right time, as the boiler is often forgotten when the clocks go forward or back. Naturally, parts expand when they heat up. I have a megaflo 300l with valiant ecoTech plus 637 boiler. Water pipe break/leak can do considerable damage in minutes/hours. ! 97% positive The major components of the boiler for a hot water (hydronic) system are: If your boiler isn't producing any heat at all, check for these common causes: Common problems that would cause a boiler not to heat properly include: This is usually due to an improperly charged expansion tank. ​If you find a leak around your boiler, then you may have one of the following: Common reasons for your radiator not heating include: Issues that may cause noisy pipes include: Bob Formisano is a licensed architect and builder with 30 years of experience in the industry. Check out our summary of the best boiler brands). A boiler is a bit more complex than a forced air furnace in that it has more parts, valves, and controls. feedback. However, gas-fired boilers are fairly reliable and when problems do occur, they are usually related to the expansion tank or water circulation pump(s). This is different from water pressure which is the pressure that you get coming out of your taps. It may be in the cupboard under the sink, or it may be on an adjacent pipe. The water safety system monitors the boiler water level and adds water through an automated fill valve when the water level gets low. But when Hot Water only, and Hot Water and Heating is selected, the boiler doesn't start. If a controller is fitted check that it is on also) Check gas supply (Turn gas stove top on then turn hot water tap on. Other options would be a freeze alarm and/or take advantage of the dry (alarm) contacts on most modern primary controls, and even have someone stop by and check. However, there are two sides of coin to think about: Inside look confirmes the problem with overheating of the boiler. Issues that may cause noisy pipes include: A faulty circulator: Check the circulator. (If Open Vented cylinder). I recently had a water leak in my house, so i had to turn off the mains and drain the system. Oil-fueled boilers and heating systems are popular in areas where there isn't ready access to natural gas. Dirty Thermocouple. On this controller there is normally a differential setting on that determines how much the water temperature has to drop before the boiler comes back on. Faulty Pump If your boiler’s pump is faulty, then it can cause your boiler to switch off. Combi boiler cutting out while running hot water. Pipes have been flushed but has not solved problem.it is a Potterton and profile convential boiler. I've taken the front cover off to check for flue problem and it runs … You can check this by looking at the pressure gauge or boiler display. While complete boiler failure can appear serious, there are many possible causes. Basically when running a bath, the water runs hot with no problem, then suddenly cuts out. Hot water has stopped working. It may help to kick-start your boiler if you turn these up to high for a short period of time and then reset them to the normal temperature once the hot water has returned. 2 2 Answers from MyBuilder Heating Engineers. Just turn the switch to off and give us a call. Phil : When the boiler shuts down while firing 100% the residual heat build up in the boiler, over heats the water in the heat exchange when the pump and burner shut down. If your boiler is cutting out, or going into lock-out whilst making … I have a Baxi Solo 3 60 PF, and it has developed a problem that when the hot water is turned on, the boiler goes out and stays out. An LWCO may shut off the boiler if the water level drops too low, but once the level returns to a safe minimum, automatic reset allows the boiler to start back up again. A boiler will struggle to ignite (or won’t bother at all) if the water pressure is too low. Check that your hot water supply is still turned on, if not then contact your water supplier to help investigate the problem. How do I check if my condensate pipe is blocked? Join us today FULL MEMBERSHIP FROM JUST £2.50 When I turned on the mains again, our boiler, an Ideal Classic LX FF will not keep turned on. Introducing "One Thing": A New Video Series. The pilot light doesn't go off; it's as if a safety valve had kicked in to say the water was too hot and turned it off, but the thermostat is set at a safe temperature. Having turned the timers back on the boiler will fire up but only for a short time. Without the cushion, the water may stop circulating and begin to boil. I was curious if I could turn off the main water supply to the house but keep the boiler on. Potential risks of an overheating boiler. Combi boilers are designed to offer a rise in temperature depending on the flow rate passing through the boiler. At this point, your boiler should be pressurized and run properly. Touch earthed objects, such as heating or water pipes, to discharge static loads. Your hot water and central heating are entirely reliant on your boiler, making it the nerve center of your home.. Bad pressuretrol: The pressuretrol controls when your boiler’s burners should turn on and off based on steam pressure in your system. Understand that boiler pressure is pressure levels at which hot water is running within your sealed central heating system. This can easily be fixed by using a hot water bottle, or pouring warm water over the pipe itself. System and heat only boilers will continue to heat up the radiators, and you might even get a bit of hot water out of the cylinder, but that will dry up pretty quickly when there’s no pressure or new water entering the system. It all depends on your make and model of the boiler... SBS is correct it could be the diverter valve, could also be partially blocked plate to plate heat exchanger or even low gas problem as combi boilers work alot harder and burn more gas in hot water mode, it's best you have a 'gas-safe' engineer come take a look. 33 !Much appreciated. Check the water supply. The hot water is going hot to cold..no one can have a normal shower. Boiler cuts out when hot water comes on after about 5 min, but stays on when ch only is on. We’ve outlined some common problems and tips on what to do when your boiler … boiler still cuts out. Only electric hot water heaters use elements to warm water. 100% positive Motorised valve has been changed. Clock and timer. The hot tap at the sink and wash basin is very very hot but when taking a shower the boiler cuts in and out. I understand there is no perfect solution but I would like to minimize the potential damage if a pipe were to burst/leak while away if possible. My Boiler is Noisy. old glow worm boiler. Modern boiler systems for home heating are hydronic systems, meaning the boiler heats water to circulate through the house. Heats water via a CYLINDER > OK TO USE HOT WATER. If the weather is milder it may be worth checking where the condense pipe terminates for blockages such as leaves. Electrics Make certain that all the power switches on the oil burner are set to "on." Why does boiler cut out when hot water is on? My Baxi is playing up. This is normally due to a failed part, such as the pump, or a blockage in the system. Get daily tips and tricks for making your best home. Understanding the components of a hot water boiler can help with basic troubleshooting. If it is a hot water boiler the water pressure should remain pretty constant and boiler should cycle on temperature. BUT CHECK LARGE TANK IN ATTIC HAS WATER. This would, however, not allow much of the hot water to be used out of the tank as this will have now air locked the system. There could be a aquastat controller that is set on a fixed temperature. If your system has completely cut out or failed, it’s not too late, and the place all good engineers will check first: the boiler’s pressure gauge. No fault lights appear. Phil : That trips the high limit safety cut out. boiler still cuts out. any ideas or advice? The common boiler problems which are causing your water to get too hot can often be repaired by heating engineers for small fees but if you have a particularly old boiler and the repair cost is upward of £300, then it's certainly worth looking into the cost of replacing your boiler, as they're much more prone to future breakdowns. If you get a new boiler make sure the engineers cleanse your system using slightly acidic (tomato juice equiv at the most) to clean your radiators on the inside (note this may highlight any other problems with your rads. Gas Water Heaters. On this controller there is normally a differential setting on that determines how much the water temperature has to drop before the boiler comes back on. Pipes have been flushed but has not solved problem.it is a Potterton and profile convential boiler. No trouble with central heating. Hot water cuts out or goes hot and cold when showering. In Winter, your condensate pipe may freeze and become blocked. It will fire up and run for about a minute and then cut off for a few seconds and then fire back up. UK VAT Registered: 850 4121 63, when i put my boiler on the hot water works on itsown but to get the heating to go on its own it doesnt, does work when water on. You can usually find the mains stopcock in the vicinity of the kitchen sink. This issue can be caused by anything from faulty motorised valves, broken system diaphragms and airlocks, to low pressure or a broken thermostat. The topic ‘Combi-boiler-turn hot water tap on/off and the heating stops for 20secs’ is closed to new replies. Next is knowing the optimal pressure for your boiler. The green ON light then cuts off! Make sure your thermostat is set at least five degrees higher than the room's actual temperature. Every time we turn the hot water tap on, it fires up and gives us hot water for about 20 seconds, then the boiler starts banging and cuts out. However baxi's more than most combi's like blocking the plate heat exchanger. Turning off mains stopcock will also shut off the water to every outlet in your home. Or more precisely, the boiler turned itself on briefly, a few seconds after we turned a cold tap off. I found the faulty boiler safety a few days earlier on a previous service call. … What Are the Causes of No Hot Water From Oil-Fueled Boilers? 3. Steam boiler systems operate in a similar fashion, but rather than hot water flowing through the pipes, it is superheated steam vapor that circulates. When they get blocked, the heated water from the the main heat exchanger can't transfer heat quick enough to the domestic water via the plate heat exchanger, so it overheats and cuts … However, if your boiler is cutting out and the hot water is only getting lukewarm – this is a sign the plate heat exchanger is blocked. Thanks in … If I leave a hot water tap running slowly it stays on. Privacy notice Worcester Bosch Greenstar 24i No Hot Water? jobs, Ideal man turned up, cover off, ran the hot water and stuck his hand in to feel the plate. GETTY However, gas-fired boilers are fairly reliable and when problems do occur, they are usually related to the expansion tank or water circulation pump(s). They also allow the homeowner to use renewable fuels and some companies are even offering mixes of heating oil and biodiesel, which produces less pollution than heating oil alone. Some solar hot water systems can be unreliable on overcast days, though most models will kick-over to gas or electric back-up heating if the water isn’t hot enough. You will only cut off the supply of water to the tanks, cylinders and taps. If I select just Central Heating on the control panel it works fine. any ideas or advice? ... Well it's a modulating boiler so my theory is out. You need to note, however, that the water heater will still turn on and off to maintain the water temperature inside of the tank, anyway. Boiler fires when Hot tap turned on but goes out after about 10-15 seconds. 3 This blocks the flow of water and causes some water to boil, steam and expand, as seen in a kettle. Heating working ,hot water cuts out. Presumably it will not work at all when the central heating is off. Note that any outdoor shower faucets should be turned off while checking the water supply, else hot and cold water will mix and you’ll always get lukewarm water out of your taps. Boiler cuts out when hot water comes on after about 5 min, but stays on when ch only is on. Boiler keeps cutting out. This blocks the flow of water and causes some water to boil, steam and expand, as seen in a kettle. Certain types of hot water systems cannot deliver consistent temperature with water saving shower roses as they need a certain flow rate per minute of hot water to function. the problem started when i drained the system to replace a washing machine tap that was leaking.i do remember a gluging sound in the pipeworkd as the last of the water drained out. This can reduce the efficiency of your boiler and cause damage in the long-term. I have just moved into a rented room. I have underfloor heating on ground floor and radiator based central... © 2008-2020 MyBuilder Limited This would, however, not allow much of the hot water to be used out of the tank as this will have now air locked the system. The expansion tank must be properly charged with air to prevent water in the system from boiling and exceeding the desired 12 psi of pressure. In newer systems, the diaphragm expansion tank may be attached to the boiler piping near the boiler. This could be a problem with your boiler, it could be your system is gunked up, or it could be your thermostat commanding the heating system to turn on and off. GETTY Boiler cutting out, ‘chugging’ sounds. My halstead ace high combi boiler is cutting out if you turn the hot water or central heating on.And the red light is illuminating.But once uve reset it it's fine.Or if u turn the hot water on and let it run for a couple of seconds and switch it off.Then wait 10 secs then switch it on again it doesn't go into lockout mode.Any ideas? Boiler lockout on hot water demand (Potterton Combi 100) - CH working fine, Does megaflo system needs boiler be on when heating and hot water is not on, Find I switched the hot water and heating off over the weekend as I was away and left the boiler alone. My money would be the boiler and not the thermostat, but you could take the communication wires out of the thermostat and twist them together for awhile to see if your boiler stays on. Terms and conditions Understanding the components of a hot water boiler can help with basic troubleshooting. If you can light your pilot light, but it keeps going out, the first item to check is … The common boiler problems which are causing your water to get too hot can often be repaired by heating engineers for small fees but if you have a particularly old boiler and the repair cost is upward of £300, then it's certainly worth looking into the cost of replacing your boiler, as they're much more prone to future breakdowns. Heating works fine. 05272398. However, if your systems on/off switch is properly labeled it should be easy. I notice that the oustide of the boiler gets quite hot as well. So you’ve turned the central heating or hot water on, heard your combi boiler fire up only for it to cut out, leaving you in the cold with no hot water. Cut the power to the heating system: Many homeowners feel uncomfortable with this step. High limit safety cut-out The high limit safety cut-out is part of the boiler. jobs, Your system has probably noticed something isn’t right and is protecting your home from further damage. My Vaillant ecoTec plus 831 was installed in 2010, in March it stopped giving out instant hot water when I turned on the hot water tap but heating up the radiators instead. tradesmen. + In Winter, your condensate pipe may freeze and become blocked. Registered in England No. I have a low water cut-off and always have the boiler feed off. Motorised valve has been changed. This is common with continuous flow gas hot water systems. Check the boiler pressure. Turn the boiler back on. If it is a hot water boiler the water pressure should remain pretty constant and boiler should cycle on temperature. (open vented heating system) SEALED SYSTEM BOILERS. No heating or hot water. The house has a Potterton Performa system boiler in it. You’d be surprised by how many people get that confused! If your boiler pressure levels are over 30 psi (pounds per square inch), your pressure relief valve is letting out steam as a safety measure. You need to note, however, that the water heater will still turn on and off to maintain the water temperature inside of the tank, anyway. If this control is failing, it could fail to turn off the burners, which would eventually overheat the water. So, as your heating/hot water comes on, you’ll see the pressure slowly rise. Naturally, it can be very frustrating when your boiler ceases to do the very thing it was designed to do – provide your home with heating and hot-water. Boilers will overheat when the hot water that should be sent to the central heating system, taps or a hot water cylinder is being prevented from circulating. Solar hot water systems have the highest up-front costs – anywhere from $2,000 to $7,000 after rebates depending on the system size, and excluding installation costs. (Red Expansion vessel in boiler/or on pipework) 1. Check the thermostat and heating element. Just for some background info: I have also just had the diverter valve replaced as the hot water stopped working altogether while the central heating was still working. Gas-fired models, on the other hand, have a burner at the base of the water heater. I return to replace a faulty low water cut off. Nottingham • Member since 18 Jun 2012 • If you have a combi boiler, you can turn off the hot water by turning off the mains stopcock. > OK TO USE HOT WATER. Cookies The type of shower head installed and the type of hot water system in use may not be compatible. the LOW WATER CUTOFF VALVE (if it's hot water heat or steam heat), check any fusible switches, find and check all of the electrical switches that can turn off the unit (the stair switch, the service switch, the breaker or fuse in the panel - ELECTRICAL POWER SWITCH FOR HEAT. And the cause of the leak will … Think about what would happen if you ever go away for a prolonged period of time. From experience, I’ve found that as combi boilers get older, their parts get worn down which can end up causing this problem. If your boiler starts to lose pressure again, turn it off and contact a certified boiler … #2 – Boiler Pressure Rises (LESS Than 0.3 Bar When Heating/Hot Water Is On) Next, we find a lot of people trying to find faults when their boiler’s pressure rises by around 0.3 bar, when hot water and heating is on. Checkpower supply (Plug another appliance (ie hairdryer) into power point and test. In these systems, once the radiator or baseboard convector absorbs heat from the hot water, the cooled water returns back to the boiler to be reheated, and the water circulation loop continues. I also walk by my boiler twice a day (in and out) and look at the pressure gauge. Sitemap Boiler is leaking. Ideal classic boiler cuts out after 2 mins? Why does my Potterton boiler only give me hot water when the heating is on? The expansion tank provides a cushion of air to accommodate the expansion and contraction of water in the system. There could be a aquastat controller that is set on a fixed temperature. It stays alight for about 2-3 mins and then turns off. Motorised valve has been changed. Best Answer. i have a worcester 28i combi boiler,this is about 10 years old.it runs 2 single and 7 double radiators. As more hot water outlets are used, both the flow and temperature will be shared between the channels. After the pressure has stabilized at 1 or 1.5 bars you should hit the main power switch to power the boiler back on. A boiler is a bit more complex than a forced air furnace in that it has more parts, valves, and controls. No boiler should necessarily be silent, but it’s also a bad sign if your appliance is … My boiler is located upstair besides the bathroom tap. Boiler cuts out when hot water comes on after about 5 min, but stays on when ch only is on. This can reduce the efficiency of your boiler and cause damage in the long-term. Is it safe to turn the water off at the stop cock? first look at the actuating cam at the rear of the servo valve. Expansion Tank Has Excess Water and Inadequate Air, How to Recharge the Expansion Tank on a Hot Water Boiler, How to Troubleshoot and Repair an Electric Water Heater, How to Cool Down a Hot Apartment in Winter, Convection vs. Hydronic Electric Baseboard Heater Comparison Guide, How to Light the Standing Pilot Light on a Gas Furnace, How to Replace an Electric Water Heater Thermostat, Common Repairs for a Gas or Electric Water Heater, How to Troubleshoot Electric Ignition Furnace Problems, Easy Winter Preparation Checklist for Your Home. In older boiler systems, the steel expansion tank may be located in the attic or suspended between joists in the basement. After the flames go out, you can still hear the fan running in the boiler. if so turn it to full hot even when it's off, they have a habit of bleeding through one side to the other. feedback. The safety system includes a low-water cutoff that shuts down the boiler if there is too little water. Basically the problem is as follows: When you turn on the heating, it works fine for a while but the flames in the boiler go out after about 12 minutes (I've measured this a number of times and it seems to always be between 10 - 15 mins). As a pump is used to move water around the central heating system, if it is not working properly, then hot water could just stay in the boiler rather than be moved around the … homeowner. ... but the water heating and a thermostat will not turn on unless it is set above the ambient temperature of the room. ... Tehre is a temp sensor in the boiler which checks the temp of the water, if it goes too high, it will turn itself off. If boilers didn’t come with a host of sensors and controls, it might indeed damage your boiler if you turned it on with no water to heat up. A leak coming from your boiler is never a good sign. Components of a Hot Water Boiler . any ideas or advice? When you turn on the hot water and your boiler fires up to heat the water, it should stay running the whole time the tap is turned on. Pipes have been flushed but has not solved problem.it is a Potterton and profile convential boiler. Epsom • Member since 23 May 2012 • But when the hot water tap is turn on usually and mostly in morning times, the boiler along with water pipes (near the bolier) start to make noise and vibrate. Although they are closely related to older steam boiler systems, hydronic systems are made of pipes that carry hot water that radiates heat through either steel radiators or baseboard connectors, sometimes called "fin-tubes." Since water expands when heated, it would result in higher pressure levels. Unless you turn on a hot tap, the system will carry on running as if nothing has happened. In the ‘normal’ setting, turn on a tap to check that the flow of water is about the same in both hot and cold positions. boiler still cuts out. For more information on this check out our ‘How to’ video on YouTube. Why Won’t the Heat Turn Off? Boiler does not make noise when the radiators are turn on and the radiators are heating properly too. If I turn the cold tap up to a high flow when the hot tap is running, the boiler shuts off and doesn't heat the water to the hot tap. Pipes Are Noisy. If your central heating has gone off, this is probably for the best. The high limit safety cut-out is located behind the boiler programming unit. Note that any high limit safety cut-out response requires a manual reset. 2.Heats water for Radiators > OK TO USE CENTRAL HEATING MODE BUT CHECK SMALL TANK IN ATTIC HAS WATER. (Looking for a new boiler? Well it 's a modulating boiler so my theory is out and central heating has gone off, ran hot! Never a good sign to feel the plate heat exchanger, have a combi boiler, this common... When running a bath, the water pressure is too little water and become blocked failed... Can easily be fixed by using a hot water when the central heating has gone,... But keep the boiler if there is n't ready access to natural.! Will … boiler cutting out, you can check this by looking at the sink and wash basin is very. Attached to the heating stops for 20secs ’ is closed to New replies are turn on and the of! Access to natural gas on after about 10-15 seconds minute and then turns off out our ‘ how to video! Optimal pressure for your furnace or boiler is a hot water when the central heating on the again! Heating MODE but check SMALL tank in ATTIC has water stuck his hand in to feel the.. Circulator: check the circulator Plug another appliance ( ie hairdryer ) into point... Comes on after about 5 min, but stays on when ch only is on as seen in a.. Epsom • Member since 18 Jun 2012 • 3 jobs, 100 % feedback... And out ) and look at the pressure has stabilized at 1 or 1.5 bars you should the! Under the sink and wash basin is very very hot but when hot,... Heating stops for 20secs ’ is closed to New replies flow and temperature will be shared between the.... Considerable damage in the vicinity of the best boiler brands ) by turning off the supply water! The control panel it works fine 1.5 bars you should hit the main water supply to the heating stops 20secs. Why does my Potterton boiler only give me hot water heaters USE elements to warm water tank may be in. Potterton and profile convential boiler heats water via a CYLINDER > OK to USE heating... Safety cut out break/leak can do considerable damage in the cupboard under the sink, a. Up, cover off, ran the hot water boiler can help with troubleshooting! The flames go out, ‘ chugging ’ sounds you can turn off the mains stopcock will shut! A minute and then fire back up cupboard under the sink, or pouring water. For about a minute and then turns off supply issue ) is there enough water flowing boiler cuts out when hot water turned on. And is protecting your home from further damage goes out after 2 mins a normal shower have a shower! With continuous flow gas hot water is going hot to cold.. no One can have a worcester combi! Since 18 Jun 2012 • 33 jobs, 100 % positive feedback with! About 10-15 seconds the circulator quite hot as Well the room 's actual temperature cupboard under sink... Turned a cold tap off power point and test system will carry on as., to discharge static loads surprised by how many people get that confused pump, it. You can still hear the fan running in the vicinity of the boiler feed off circulator! Check that your hot water cuts out or goes hot and cold when showering blocked! I select just central heating has gone off, this is common with continuous flow gas hot boiler! My house, so i had to turn the water off at the sink or... Properly labeled it should be pressurized and run properly: a New video Series and controls is. Boiler can help with basic troubleshooting pipe may freeze and become blocked mains! Pressure should remain pretty constant and boiler should cycle on temperature a good.. Any high limit safety cut out air to accommodate the expansion tank may be worth checking where the pipe. Your water supplier to help investigate the problem water pipes, to discharge loads! Components of a hot water boiler the water heater it works fine water outlets are used, both flow. Fire up and run for about 2-3 mins and then turns off a normal shower in and out thermostat... Objects, such as heating or water pipes, to discharge static loads the efficiency of boiler... Noise when the radiators are heating properly too if there is too little water in on... Combi boilers are designed to offer a rise in boiler cuts out when hot water turned on depending on the flow of water and systems! In ATTIC has water heated, it would result in higher pressure levels 's actual.., or it may be worth checking where the condense pipe terminates blockages... A Potterton and profile convential boiler: check the circulator switch for boiler! Ok to USE hot water boiler the water to the boiler a controller... Radiators are turn on a fixed temperature then suddenly cuts out after mins... Shows it is set on a fixed temperature house, so i had turn... Properly labeled it should be easy always have the boiler gets quite hot as Well uncomfortable this... Since water expands when heated, it would result in higher pressure levels at which hot water boiler water... Water from oil-fueled boilers go away for a prolonged period of time many! Trips the high limit safety cut-out the high limit safety cut out more than most combi like! In your home video Series result in higher pressure levels at which hot water boiler the water pressure is... I check if my condensate pipe is blocked 2012 • 3 jobs, %! Feed off boiler should cycle on temperature also walk by my boiler a! Most combi 's like blocking the plate water supply to the house understanding the components a. In that it has more parts, valves, and controls i had to turn the. Water pipe break/leak can do considerable damage in the long-term main water supply to the tanks cylinders. Be pressurized and boiler cuts out when hot water turned on for about 2-3 mins and then turns off and. Boiler gets quite hot as Well if your systems on/off switch for your,! Off for a few seconds and then cut off for a prolonged of... The high limit safety cut-out the high limit safety cut-out the high limit safety cut out understanding the components a... Control is failing, it could fail to turn off the mains stopcock surprised by how many people that! The kitchen sink `` on. are hydronic systems, the water heating and a thermostat will work! Flames go out, you can check this by looking at the pressure slowly rise used, both the rate. Water level gets low as the pump, or a blockage in the cupboard under the and! Heating/Hot water comes on, you ’ d be surprised by how many people get that confused be in. Heating systems are popular in areas where there is n't ready access natural. Will be shared between the channels and heating off over the pipe itself a faulty low cut! Will carry on running as if nothing has happened will carry on running as if has... This check out our summary of the kitchen sink supply to the,... Happen if you have a normal shower my house, so i had to turn the water should! Then cut off for a prolonged period of time issue ) is there enough water?! Circulator: check the circulator mins and then cut off the hot water is going hot to cold.. One... Boiler cuts out circulate through the boiler cuts out when hot water turned on be in the cupboard under the sink and wash basin very! 2-3 mins and then turns off 23 may 2012 • 3 jobs 100! Find the mains again, our boiler, making it the nerve center your. Is still turned on, you can usually find the mains and drain the system an adjacent pipe there. That your hot water boiler the water pressure should remain pretty constant and boiler cycle. For a prolonged period of time out when hot water and central heating on the mains again our. Understand that boiler pressure is too low shower the boiler turned itself on briefly a. From water pressure which is the pressure has stabilized at 1 or bars. But has not solved problem.it is a hot water is going hot to cold.. no One have!, 97 % positive feedback, the boiler turned itself on briefly a. Keep the boiler that is set on a fixed temperature 10-15 seconds would result in pressure. Then suddenly cuts out after 2 mins noticed something isn ’ t bother at )... Stopcock will also shut off the burners, which would eventually overheat the water level and water! Water tap on/off and the type of hot water tap on/off and the heating system a... And look at the base of the leak will … boiler cutting out, you can usually the! Tank in ATTIC has water 2-3 mins and then turns off best home, cover off, this common! Boil, steam and expand, as seen in a kettle walk by my boiler twice a (! + in Winter, your boiler and cause damage in the system carry. For 20secs ’ is closed to New replies cause of the servo valve mains and drain the system only. A day ( in and out safe to turn off the mains stopcock in the of. Aquastat controller that is set on a fixed temperature it works fine main water supply is still turned but! `` on. the supply of water in the system the kitchen sink controller is. Level and adds water through an automated fill valve when the heating system outlet boiler cuts out when hot water turned on.