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Goodman U-30 Furnace

I have a Goodman gas furnace Model U-30. Electric Ignite. Went to turnit on for the first time this year. When setting temp on thethermostat, you can hear it click, but no fire. Followed instructionson door to turn off all electricity to it, turn gas off, wait 5minutes, turn gas back on, turn all electricity back on it. Still won'tlight. The only thing I hear is a humming noise from the unit itself. We didnot turn the gas off to it last year so I don't think it is off. Afraid to mess with that myself.

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  • anotherday Oct 25, 2008

    This is actually a GMP075-3 Model. Sorry about that.

  • anotherday Oct 25, 2008

    Also, the red light is blinking 3 times. I don't have a code sheet.

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Observe the sequence of operation. stat calls for heat and sends a signal, to furnace. check for 24 volts to common and white wire at furnace.first the forced draft motor starts and should have 120 volts to the plug it attaches to. after forced draft motor starts the pressure or vacuum switch closes should show no 24 volt when checked across terminals. shortly after the ignitor glows and shortly after click the main gas valve opens and main burners fire. shortly after the indoor fan comes on and hot air blows into the ductwork. follow the chain of events to see what doesnt happen and it is a clue to whats broke. maybe start by switching fan switch on stat to on. if fan comes on you have high and low voltage thereby eliminating the stat power and transformer as a problem. if you can see the ignitor look for it to be cracked . look close dont touch any part of it .it is powered by 120 volts when energized from board. dont forget when you take the door off there is no power to the furnace so be prepared to tape the safety switch closed when you are diagnosing.

Posted on Oct 24, 2008

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