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