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QUESTION:Need help troubleshooting a new installation of a Goodman 70K btu 95%
efficiency two stage gas furnace (Model GMH950703BXA). Brand new.
Replaced old furnace with new. Unit ran fine for about 30 minutes and
then cycled itself off. No flashing diagnostic light until tried three
times and then single diagnostic to indicate three failures and that
gas not being delivered to burners.
Gas pressure fine.
Unit cycles on, blower runs, igniter heats up but after 15 seconds
igniter turns off because flame senses nothing. Not sure why it will
deliver gas to burners anymore. I checked the gas valve while running,
after igniter heats up, I can confirm valve does not open. I know
valve is not the broken because I took valve from another new unit and
still same results. In fact, tried replacing every part except the
combustion fan
The only thing I can think of is that we did not do the direct
venting. While testing, left air inlet as is and combutsion out was
vented to existing flue from old furnace (4" flexible tube).
If venting was the issue, wouldn't the unit at least burn for a time
and then cycle off ? Now cannot get any gas to be released by valve to
the burners. Tried turning off gas, shut off gas valve, shut off
electricity, and re-started everything again, but same results. Tried
4 or five more times.
ANSWER: You tried a gas valve out of another new unit?
Did you try another control board? (Maybe I missed that...)
Does the pressure sensor close after the inducer runs?
I gather this is some temporary setup with venting.
Don't see how that would affect it.
Is the electric service to the furnace control properly
Grounded AND is the polarity correct? (Wh Neutral, Blk Hot)
The control is very sensitive to those conditions.
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