Goodman furnace model # GMNT100-4B On vacation neighbor checked house house filled with gas. He shut off main and furnace. Came home turned on gas to everything except furnace. All good. Furnace will not light. The indicator light is solid red. Any suggestions on next troubleshooting step. Thanks.
Re: Goodman furnace model # GMNT100-4B On vacation...
From my experience with goodman units ,it could have been a gas supply problem there are so many protective sensors that i dont think it is the unit by the way is it electronic ignitor or pilot
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According to this page, you can usually fix this 4 blink diagnosed problem by changing the air filter or tightening wiring (which it has a cautionary warning about tightening such too much) and checking the flue for blockage. The furnace has activated the primary open limit circuit.
Poor air flow in the Goodman caused by blockages can result in the tripping of the rollover switches which would cause it to blow cold air. That is a safety measure. You don't want gas furnaces burning with insufficient air. Think carbon monoxide. Besides the air filter, the flame sensor or the burner could be dirty. The idea of trying to DYI that cleaning job is rather off putting. I hope changing the filter would work.
I trust it is not a fuse in the pilot flame sensor circuit blown. A repairman has the voltage testers for checking the electronics involved.
I can empathize with this. My furnace, another brand, went out recently. The repair man didn't know why it went out but simply adjusted a handle controlling gas flow to a position slightly different from what was recommended and it worked. All for $200.
www.do-cu-cu.com/Goodman-Dependable-92-Furnace-Manual.pdf
Goodman dependable 92 furnace manual shop for goodman gas furnace repair parts for model gmpn1004 at sears partsdirect. find parts, manuals & diagrams ...
Check roll out switches located around burner compartment.
there is a small square button between the wire terminals press firmly down on it to rest switches. If this solves the problem have the furnace cleaned and checked by a professional HVAC technician.
Check all safety switches on door. Make sure the main breaker in fuse box is on and well as main switch on furnace. Please ad more details. New install, just quit working? How old....
Solid red typically means bad controller. Try unplugging the furnace, wait about 30 secs, then plug it back in. The possibility that the controller was sending voltage to the valve even when there was no flame is a bad sign. If the controller starts the furnace, watch it very closely and see what it does. If the solid light comes back on, it's time for a new board.
You need to type GOODMAN GAS APPLIANCES into you browser to find you local servicecenter. I must tell you that Goodman only sells to authorized service companies in my experience. So you become EgKraft Company.
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