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Voltage light comes on and shuts off heater

When I turn it on it fires up o.k. but after about 10 seconds the voltage light blinks on and kills it. I checked the ground wires and they seem fine.

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Re: Voltage light comes on and shuts off heater

I happen to be in the heater buisness too and the problem you are having is more than likely due to a faulty thermostadt. Many factories buy there thermostadts in the US and have them shipped to China. Last year many of those shipped were defective and are pre-set to shut off lower than where they should due to a faulty internal setting from the thermostadt manufacture.

Posted on Jun 02, 2009

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Re: Voltage light comes on and shuts off heater

If the unit has a flame sensor, a rod at the burner opening, sometimes if you remove it and clean it with steel wool, this might solve the problem.

Posted on Jan 19, 2008

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Error code 12

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Short circuit on the low voltage side of the wiring (12V) This will show as an immeadiate error code 12 befoe the thing even tries to light.

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My goodman furnace will start to ignite, then it glows and then shuts off. THe fan keeps blowing. The red light blinks once. The system code says "system lockout".

Another part that you might want to check is the flame sensor. It is a very good chance that this is the problem, the stat calls for heat, the induced draft motor (little motor on from of furnace), ignitor comes on, the main burner fires, just for a second or two, the burner shuts down, the main blower motor defaults to blower on!
If this is the issue;
Then this is what you do to fix it, kill power to the furnace, look where the burners are, to the left side there is a little wire, usually yellow or orange running to what kinda looks like a spark plug, one screw should be holding it to the burner bracket. take it out, at the end of the white porcelain is a small metal rod sticking out, it probably has a slight bend in it.
take some steel wool, or sand paper and clean the rod till is is nice and shiny, NOTE: when you take it out, it won't look really dirty, maybe just like a pencil lead,,,,it is dirty!
Just use the sandpaper and clean the rod till it looks like metal, "do not sand the white porcilen". Put the part back in and turn the power back on and run the furnace as usual.
90 % chance that this will fix your problem.
The rod get a build-up on it from the sulfur that is added to the gas, and has a hard time passing the milli-volt signal back to the furnace computer, which is passed from the ignitor, through the flame, to the sensor! This way the computer knows that all of the burners are firing and it is safe to run!
Please take time to come back and rate me, or contact me with any further questions!
Have a warm day :)
Paul Gibson

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