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Goodman GMP050-3 furnace With thermostat in of position and auto fan it will start the blower motor once in a while and blow cold airand then shut off.

With a new thermostat installed the furnace will run the blower fan once in a while with the thermostat set in the off position and blower on auto. Would this be a bad board?

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  • vjbegger
    vjbegger Dec 11, 2012

    I have a Goodman furnace model GMP050-3 that turns the blower motor on when the thermosat is in the off position and the fan switch set on auto. After it runs awhile it shuts off and and later it will start up again.

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SOURCE: furnace won't stay running

1
1 FLASH
Furnace fails to operate.
• Integrated control module
diagnostic LED is
flashing ONE (1) flash.
• Furnace lockout due
to an excessive
number of ignition
“retries” (3 total)1.
• Failure to establish flame.
Cause may be no gas to
burners, front cover
pressure switch stuck open,
bad igniter or igniter
alignment, improper orifices,
or coated/oxidized or
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sensor.
• Loss of flame after establishment.
Cause may be
interrupted gas supply, lazy
burner flames (improper gas
pressure or restriction in flue
and/or combustion air
piping), front cover pressure
switch opening, or improper
induced draft blower
performance.
• Locate and correct gas
interruption.
• Check front cover
pressure switch
operation (hose, wiring,
contact operation).
Correct if necessary.
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igniter.
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Posted on Nov 25, 2008

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SOURCE: Heater no longer works on auto fan, only manual fan

When you call for fan in auto ensure your getting 24 volts at pin on control board, if it is not energizing then there is a problem with the relay.. Before you change out the expensive control board, try the therm..

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I have a goodman GMP075-3 that won't turn on. I think it is the pressure switch since I do not have a vent blockage. What is a venter and where can I find it??

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SOURCE: GMPN 100-4 furnace. Blower motor runs when not calling for heat.

The board is bad. The unit thinks a flame is present, so it tells the blower to come on. Replace the board.

Posted on Oct 08, 2009

Therinnaiguy
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SOURCE: Ihave a goodman GMPN furnace. The blower will not

Maybe not! there is a limit switch that has opened not allowing power to pass and start the furnace. You will need to tale a Ohm meter and follow the wires thru any safety switch. In your case, it may be the thermo-disc near or over the burner box. Jump it out to test it. Now why is your blower not working (which could have been the reason why the thermo-disc opened)? Once you find which safety switch is open and you have jumped it out, take a jumper wire and jump between the R and G terminals on the circuit board. This should start your fan. If not, either the fan is stuck, the fan motor is bad or hopefully noy; the circuit board is bad.

Posted on Jan 18, 2010

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