![]() So if it's not the flame prover you have a lot of ground to cover. The most common reason for replacing the gas valve assembly is if the gas valve does not open, making the furnace unable to heat the house. ![]() That'll keep burning as long as the pilot flame is lit, respectively call for heat (thru thermostat) remains. This video provides step-by-step instructions for replacing the gas valve assembly on Lennox furnaces. Once the pilot flame is established the signal goes back to the module which then turns off the ignitor and opens the main burner valve (and gets the burner going, of course). It could, for instance, be that the signal for the gas valve to open is not sufficient to open completely, the ignition spark thus not meeting enough gas to ignite.įor better understanding, usually a call for heat will send a low voltage to the ignition module which in turn sends power to open the pilot part of the gas valve and, at the same time, high power to the ignitor to create spark. Then there could be an imbalance in the pressure switch.Ĭheck that all wiring connections are good and sound. File Type PDF Lennox Pulse G14 Manual My dad made sure that I knew the rudamentary workings of a furnace, how to light it, trouble shooting, etc. They can also crack with age so look at the flame pattern. Lennox Gas Furnace Service Manuals - /10. ![]() ![]() If that eases the problem I'd nevertheless get a new one and install it. Get a bit of very fine sandpaper and rub the metal part that is in the flame. Not familiar with the Lennox but I'd look at the flame prover first of all.
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