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Goodman furnace draft inducer motor doesnt start so nothing happens have volts from thermo steady light on board

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  • scott skala Nov 13, 2010

    when i checked it last night in the dark i wasnt getting any voltage at motor. ac works fine, isnt there a relay for that motor? i also noticed that there isnt that normal click sound at the beginning of cycle. could there be something holding relay out, some sensor, or do we have to go directly to replacing the board?

  • scott skala Nov 16, 2010

    yes it seems relay is built in board

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  • Goodman Master
  • 43,501 Answers

Hi,

Using a voltage meter check and see if you have 120 volts at the motor... if so then the motor is bad....

If there is no voltage to the motor then the board is bad....

Replace the motor or board as needed...

heatman101

Posted on Nov 13, 2010

  • D. Floyd Kolb
    D. Floyd Kolb Nov 16, 2010

    Your right... the relay is in the board and you will need to install a new board...

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  • Goodman Master
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See if you are getting power to the inducer motor. Does the motor have continuity between the 2 leads? If not then the inducer motor is bad. You either have a bad board or inducer motor. My guess is the inducer motor. You gotta do them checks to confirm that though. It starts with that board which powers the inducer then to confirm it is on the proving switch has to get suction produced by the inducer. That sets of a timing sequence and the igniter comes on. After the end of the timing sequence the gas is release and is ignited . The flame sensor then has to confirm ignition. None of which is gonna happen if the inducer does not come on. I would suspect the relay on the board or a bad inducer motor.

Posted on Nov 13, 2010

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2: Hot surface ignitor comes on and glows
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4: Flame sensor detects flames
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If the inducer motor never came on, then you start looking at power to the unit, thermostat issues, or inducer motor issues. Just a few places to start. Hope this helps!

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1 Answer

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This is probably a ignitor.


1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution:You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks.Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. Please see "limits, rollout switches & furnace control boards" further down on this page. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.
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