I'm having an issue with my Goodman GMP075. In the winter, the fan blew, but the gas wouldn't come on. I didn't care much, since the unit was for my upstairs area and kept it cool anyway. Now, mid summer I'm having the same problem with the air conditioning. The fan will blow, but the compressor/fan outside does not usually come on (less and less frequently). I've changed the t-stat and there is no change. At times, I can't turn off the fan motor, even with the switch in off. I have to cut power to the unit to turn it off. This is even after the normal time out that should occur.
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the pilot light runs from a very small gas jet and should not be affected by the power outage
however that is not to say that the jet may have frozen over and become blocked putting out the pilot light
AS the system needs power to drive the fan it is possible that without the fan and safety system working , the main gas supply solenoid would have shut down and that could have affected the pilot light
with the power reinstalled try lighting the pilot light
I would say that there would be a pizo starter on the front of the unit to light the pilot loght
I am not a furnace tech but, there are several inputs to a gas valve. There must be an 1) electrical/mechanical indication that there is a draft fan running (to move potentially explosive gas so it doesn't accumulate), 2) adequate gas pressure to the valve, 3) the thermostat must be calling for heat 4) and electrical indication that there is an ignition source. In your scenario, you have the source of ignition, the gas valve is picking up the burner but the gas valve believes there is something missing so it shuts off the gas to the burner. In this case, I suppose you might not have enough gas pressure (is another gas appliance running or is the line to the furnace too small?), a thermocouple probably isn't the problem since the burner wouldn't pick up if the gas valve didn't believe the ignition source wasn't good enough. You could have a plugged chimney or exhaust pipe if it is direct vented since there is also a pressure switch that detects whether there is enough draft once the burner picks up. Really should call a furnace person especially if you don't have a carbon monoxide detector that you trust. If you think you are capable of continuing, you could jumper the various inputs the the gas valve one by one until the burner picks up and stays picked up. Whichever terminals you jumper that accomplish this, is the culprit. Look at the schematic on the side cover to the furnace for this information. Hope this helps...
Yes! make sure the door is on the unit to close the power switch first and observe the cycles. This should be a 4-step cycle, #1, vent fan turns on.... #2 the pilot lites ups.... #3 the gas valve sends gas to the gas ports to heat up the box...& #4 the main fan should comes on!T Y V M !
sounds like the primary limit typically behind the gas valve its larger then the others, rectangle in shape with 2 wires going to it. be careful if your bypassing limit this can create a very hazardous condition