Hi folks,
I have what I think is a bad gas valve and I'm hoping someone here can confirm or suggest what else it could be.
Overall the problem is that main burners don't stay lit. Pilot will light, main burners sometimes light up, but then go out. Most of the time it's just the pilot light cycling on and off.
There's a video at http://ift.tt/1A1EV6S. It's a bit long - skip forward to about 3:30 for the important part.
Obviously I've unmounted the mercury switch in the course of messing with things. The other thing I've done here is put an LED+2K resistor from each of the hot/cold terminals from the mercury switch so you can clearly see what's energized.
At 3:32 you see the cold line (left LED) is energized and the pilot lights. Then in a few seconds, the cold line de-energizes, hot line (right LED) energizes, and pilot light goes out. That's what's happening in most of the 3.5 minutes you skipped over.
At 3:41, the hot line energizes while the cold line also stays energized, and the main burner lights up (yay!). But around 3:49 the cold goes off again, pilot & main burner go out immediately with the cold shutting down, and then eventually hot turns off and the cycle of not lighting starts again.
Here's the wiring diagram from inside the door:
http://ift.tt/1A1EWrq
If I'm reading this right, the "RAP" in the bottom right corner should be the mercury switch and the "AGV" right above it is the gas valve. Now, it looks like that "cold" wire should be energized in either of two ways: by RAP connecting terminals 3 & 4 (in the cold position), or by the pressure switch in AGV connecting 3 & 4 due to pressure switch in AGV.
So when I see both lines energized, that's what it *should* do, and when I see just the hot line energized, it means the pressure switch in the gas valve isn't closing the circuit.
The common suspect in how-to's on the web (none of which seem to address the exact symptoms I'm seeing) seems to be the thermocouple/mercury switch, but based on these observations I don't think that's at fault here.
Can anyone confirm? Or have suggestions to diagnose?
Thanks!
I have what I think is a bad gas valve and I'm hoping someone here can confirm or suggest what else it could be.
Overall the problem is that main burners don't stay lit. Pilot will light, main burners sometimes light up, but then go out. Most of the time it's just the pilot light cycling on and off.
There's a video at http://ift.tt/1A1EV6S. It's a bit long - skip forward to about 3:30 for the important part.
Obviously I've unmounted the mercury switch in the course of messing with things. The other thing I've done here is put an LED+2K resistor from each of the hot/cold terminals from the mercury switch so you can clearly see what's energized.
At 3:32 you see the cold line (left LED) is energized and the pilot lights. Then in a few seconds, the cold line de-energizes, hot line (right LED) energizes, and pilot light goes out. That's what's happening in most of the 3.5 minutes you skipped over.
At 3:41, the hot line energizes while the cold line also stays energized, and the main burner lights up (yay!). But around 3:49 the cold goes off again, pilot & main burner go out immediately with the cold shutting down, and then eventually hot turns off and the cycle of not lighting starts again.
Here's the wiring diagram from inside the door:
http://ift.tt/1A1EWrq
If I'm reading this right, the "RAP" in the bottom right corner should be the mercury switch and the "AGV" right above it is the gas valve. Now, it looks like that "cold" wire should be energized in either of two ways: by RAP connecting terminals 3 & 4 (in the cold position), or by the pressure switch in AGV connecting 3 & 4 due to pressure switch in AGV.
So when I see both lines energized, that's what it *should* do, and when I see just the hot line energized, it means the pressure switch in the gas valve isn't closing the circuit.
The common suspect in how-to's on the web (none of which seem to address the exact symptoms I'm seeing) seems to be the thermocouple/mercury switch, but based on these observations I don't think that's at fault here.
Can anyone confirm? Or have suggestions to diagnose?
Thanks!
Main burner only lights for short time; pilot cycling on/off
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