Question about Heating & Cooling
Hi, on a call for heat from your thermostat, you get a signal to your ignitor module to send voltage to your pilot glow plug. As it glows it sends a signal back through the flame sensor to tell the MGV, (main gas valve) to open and start the burners. When this glow plug glows, you should here a click at the gas valve as 24 volts is sent to it to open. Unless the gas is off for some reason, which I doubt you turned it off, the gas valve is shorted out. You might want to try this first, with the power off the flame sensor that is beside this glow plug as we call it may be dirty and not sending a signal back to open this valve. It is about 4 to 6" long and round, made of porcelin with a metal tip on the end. Take a piece of sanding cloth or steel wool and clean the tip, so it gets nice and hot from the glow plug. Turn the power back on and cycle the thermostat on heat again. The inducer motor will start first, then close the pressure switch and the plug will glow. After this, it will send a signal back to the module to open the gas valve. Hopefully this is the problem, just a dirty flame sensor. If that didn't do it, the gas valve is bad and will need to be replaced. Please rate me on this as I know you will be kind. If its a dirty flame sensor, you should be up and running in no time at all.
A/C, & Heating Contractor
Posted on Sep 28, 2010
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Posted on Jan 02, 2017
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