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Anonymous Posted on Oct 25, 2011
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I have a Heil H9MPDO75F2AZ QUIET COMFORT FURNACE and have replaced pressure switch and still not running

Code was showing something wrong with the pressure switch, so replaced switch and checked furnace for clogs and condensation and still code still blinking 3 times! help please!

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  • Posted on Oct 26, 2011
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Hi Kim,
A couple things to check:

1) OK, you've replaced the pressure switch - good stuff. But the neoprene hose running from the pressure switch to the inducer motor... does it have any tears or cracks? Is the hose fittings clogged on the inducer side? Clean/replace as necessary if so. You cannot have any leaks or restrictions in this hose.

2) Try disconnecting the inducer (spent fumes exhaust fan) motor and check this motor coil for continuity with a multimeter. If the motor coil is dead, you'll need to replace the inducer (about $120.00?).

3) Check during initial startup of a heating cycle that there actually is 120vac arriving at the inducer motor coming in from the control board. If not, your board may be at fault.

Hope this helps!
Papa Fixit

  • Anonymous Oct 26, 2011

    Thank you so much! I did check the hose for cracks, does not appear to be any, Will check all the rest of your suggestions! Thanks so much!

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  • Posted on Dec 19, 2011
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I have a Goodman 110 btu furnace and it will run about a day to a day and 1/2 and will not run with the Covers on..

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  • Posted on Oct 26, 2011
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REMOVE FILTER FOR PUMP.. TRY GAIN .. NO.. SHORT (JUMP)THE PRESSURE SWITCH THAT JUST INSTALLED.. MOST OF THE TIME IT'S DUE TO A PLUGGED FILTER. MAKE SURE YOU HAVE A GOOD WORKING PRESSURE GAUGE ON YOUR FILTER.

  • Jay Finke
    Jay Finke Oct 26, 2011

    OOOPS SORRY WAS THINKING POOL HEATER..

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