At a loss on what should have been an easy problem

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  #1  
Old 01-07-20, 03:26 PM
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Angry At a loss on what should have been an easy problem

Having issues with my furnace. It is an older Goodman GMP075-4 running on natural gas. The igniter will glow and flames will ignite, but it then immediately goes out. I have cleaned (then got a new) flame sensor, new high limit switch and new pressure switch but still the same problem. I can hear the click of the gas coming on and the induction fan is working fine. The board is not throwing any error blinks. New filter installed. I am at a loss, any help is appreciated. I did install a Ecobee thermostat around the end of November, but this issue just started at the end of December or so.
 
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Old 01-07-20, 05:59 PM
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Make sure the flame sensor is well into the flame.

Verify there is a good ground from the board to the funace & furnace to the home's electrical ground.

Just to eliminate the possibility of the thermostat, disconnect it & jumper or twist the red & white wires together.
 
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Old 01-08-20, 11:01 AM
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What error do you get when the burner lights and then shuts off right away?
Check the mA of the flame rod with your meter.
And please stop replacing random parts. Diagnose first. Then replace only whats needed.
 
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Old 01-08-20, 11:40 AM
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Why I am replacing ransom parts, is there is NO error code. Nothing electrical that is giving me any indication of anything wrong. Plus the parts are super cheap, I have literally spent less than $30 on the 3 parts replaced so far.
 
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Old 01-08-20, 12:06 PM
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Then check grounds. And check the signal from the flame rod.
Also check to make sure your heating call isn’t dropping out right away.
This can also be a pressure switch problem with the switch opening and closing right away on ignition.
 
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Old 01-08-20, 01:30 PM
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Could be gas pressure issue . check gas inlet and outlet pressure if you have manometer.
 
 

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