Question about Goodman GMS90703BXA Heater
I'm getting the 1 flash LED code due to a failure to establish flame. Looking at the troubleshooting chart, the most likely reason seems to be an improperly connected flame sensor. The unit is less than 2 years old, and in excellent condition. I had an issue with the A/C a few months ago, and my guess is that the service person that fixed the A/C problem inadvertently did something that caused the heat not to work (we didn't test the heater after the A/C fix - I learned something there). It's definately not a pressure switch stuck open (though I guess it could be a faulty pressure switch). holding the pressure switch, I see the igniter light up three times, no flame, then lockout with the 1 flash code. any help in checking if the flame sensor is connected properly would be greatly appreciated. I can't seem to figure it out from the wiring diagram. thx much.
I the electrical gas switch valve set to on? If not...
Is there also a gas valve and is it on? If so...
Does the exhaust fan turn freely?
If not then then electrical gas valve will not open the gas valve. I have seen these bearing get loose and then the exhaust tips toward the inside inhibiting the fan from turning. Note: this is not the large blower but a smaller fan for the exhaust fumes.
Is the Vacuum hose from the exhaust to the sensor in good condition and attached at both ends? If not fix hose or connect both ends.
When repairing a unit, many tech will turn off the gas for saftey.
Posted on Nov 10, 2007
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