The fan blower should come on. No power to furnace. Problem: Furnace ignitor will not glow. Move the lever on the thermostat to the “ON” position. It … Oil Fired Furnace or Boiler Cad Cell Relay / Protect-O-Relay FAQs. Common causes of this problem: Your thermostat fan setting is set to ON. It is not necessarily the pressure switch! 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. When I turn the thermostat to call for heat nothing happens. Unfortunately, this means that these homeowners misunderstand how this feature works. Updated: August 25, 2020. Check reset button on protector relay. 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. Check the tubing from the inducer. Caution: the burners may not burn properly. be ready to pull the power. Electric troubles are responsible for most heating system failures, and this includes gas furnaces and heat pumps as well. Turn it to AUTO and see if that helps. If the fan still does not turn off, there’s a malfunction with thermostat or the furnace’s fan relay switch. Check furnace switch, main electrical panel furnace fuse or circuit breaker. Electric furnace problems can be tricky to solve because there are so many possible causes, and also because the problem can be intermittent. Thermostat calls for heat. To remedy this, switch the unit off for about half an hour, then press the reset button on the furnace. When I let go, the circuit opens and the furnace stops. Make sure that your furnace switch is “ON” the furnace blower compartment door is on and secure. A malfunctioning relay means the HVAC system can’t distribute the treated air until the problem is corrected. Thermostat or fan relay switch problem - Turn the thermostat to OFF. 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. Thermostat faulty. If … Follow these four steps to successfully restore motor blower functions: Review the owner’s manual. Other electric wiring malfunctions. On 2018-01-22 by (mod) Call a professional to replace whichever is the problem. Steps to Replace a Motor Blower Relay. I have a Honeywell Aquastat Relay L8148E. Do not short the pressure switch itself. A gas furnace pressure switch closes to allow current to pass through and start the ignition of the furnace. All heating systems, including oil furnaces, contain many different parts and mechanisms. The furnace should start. Usually, fixing this requires replacing the limit control switch. You should be getting 24 to 28 volts AC between the W (white) and C (com) terminals on your control board. Switch it back on and see if this corrects the problem. If a furnace has a bad ignitor, open limit switch, open rollout switch, open pressure switch or bad control board. These guides often include troubleshooting steps that help you narrow down possible issues. When problems occur with an oil system, homeowners may push the oil furnace reset button repeatedly. This is what I see in the furnace sequence of operation: 1. If the pressure switch is stuck, it does not send enough power to the inducer, and therefore, the ignition sequence does not begin. The problem could even be related to a thermostat fuse. The pressure switch is an indicator of pressure problems in the furnace. 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 … If the unit starts, there is a pressure problem. Troubleshooting procedure: 1. 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