Check reset button on protector relay. When problems occur with an oil system, homeowners may push the oil furnace reset button repeatedly. It … If I lift the Switching Relay (close the circuit), it works. Caution: the burners may not burn properly. If the fan still does not turn off, there’s a malfunction with thermostat or the furnace’s fan relay switch. Power it back on and see if this corrects the problem. The pressure switch is an indicator of pressure problems in the furnace. Check furnace switch, main electrical panel furnace fuse or circuit breaker. Do not short the pressure switch itself. Common causes of this problem: Your thermostat fan setting is set to ON. If that’s the case, it may require a few tries to get to the bottom of the issue that’s causing the HVAC fuse to blow. I stuck something under the Switch Relay to keep the circuit close. Check the tubing from the inducer. Updated: August 25, 2020. Make sure that your furnace switch is “ON” the furnace blower compartment door is on and secure. Other electric wiring malfunctions. If the pressure switch is stuck, it does not send enough power to the inducer, and therefore, the ignition sequence does not begin. If the unit starts, there is a pressure problem. Oil Fired Furnace or Boiler Cad Cell Relay / Protect-O-Relay FAQs. Usually, fixing this requires replacing the limit control switch. These guides often include troubleshooting steps that help you narrow down possible issues. Thermostat 1C26-101 •1 Heat,1 Cool •24 Volts •Snap-Action •System Switch - Heat, Off, Cool •Fan Switch-Auto, Continuous •Profile-Vertical Rounded •Range 50-90°F •MERCURY FREE Coleman Furnace … Problem: Furnace ignitor will not glow. No power to furnace. Simply put, your gas furnace is made up so that when you power the furnace and adjust your thermostat, the control board gets a call for heat. I have a Honeywell Aquastat Relay L8148E. Thermostat calls for heat. When I let go, the circuit opens and the furnace stops. Questions & answers about cad cell relay or protect-o-relay primary control reset and reset button problems posted originally at this article RESET SWITCH, CAD CELL RELAY - topic home. A malfunctioning relay means the HVAC system can’t distribute the treated air until the problem is corrected. Call a professional to replace whichever is the problem. The problem could even be related to a thermostat fuse. Steps to Replace a Motor Blower Relay. Thermostat or fan relay switch problem - Turn the thermostat to OFF. Also look for any other hand operated switch, such as an old poorly located furnace switch that was not removed during furnace replacement. Electric furnace problems can be tricky to solve because there are so many possible causes, and also because the problem can be intermittent. Unfortunately, this means that these homeowners misunderstand how this feature works. The furnace should start. You should be getting 24 to 28 volts AC between the W (white) and C (com) terminals on your control board. When I turn the thermostat to call for heat nothing happens. A gas furnace pressure switch closes to allow current to pass through and start the ignition of the furnace. If … Turn it to AUTO and see if that helps. Switch it back on and see if this corrects the problem. Troubleshooting procedure: 1. Follow these four steps to successfully restore motor blower functions: Review the owner’s manual. Be sure to review the troubleshooting advice given there. Electric troubles are responsible for most heating system failures, and this includes gas furnaces and heat pumps as well. The furnace motor can become overloaded at times as well. be ready to pull the power. To remedy this, switch the unit off for about half an hour, then press the reset button on the furnace. Thermostat faulty. On 2018-01-22 by (mod) The fan blower should come on. It is not necessarily the pressure switch! 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