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Janitrol/Goodman GMP075-3 Draft Inducer Fan Won't come on

Went to turn on heat this year, won't work. The draft inducer fan does not turn on, therefore the pressure switch will not close. 3 blinking lights. Cleaned out the blower assembly, blew and sucked pressure switch relay, tried start up process with one wire off pressure switch relay, any suggestions?

Turning the fan to "on" on the stat does make the fan come on. When turning the heater on, you get a click meaning the stat is telling the heater to come on.

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  • anotherday Oct 28, 2008

    Jason thanks for your help. We knew nothing about furnaces when we started. Your step outline helped us figure out the problem.

    We pulled the draft inducer motor off to clean it. There is a lot of rust on it. The fan would turn but it was having problems. Finally, it started turning freely. I guess there was some rust in it that we knocked loose when manually turning the fan and it is working now.

    Why all the rust? Does it mean I have a water problem somewhere? How do I fix that? Do I need to put a little on the fan?

  • Anonymous Nov 21, 2008

    I have the same problem. But it only happens 2 or 3 time in a season.
    The motor seems to want to run and is hot. If I give it a little boost
    on the cooling fins it starts and runs fine for a month or so. Unit is
    a Gibson KG6RL

  • ranger32740 Jan 22, 2009

    i had the same thing happen i was told to take a little black grease and put on the shaft cloes to the bearings.The front is a little had to get to and the back is easy when motor turns it will pull grease into the bearings.Black grease only thats what they told me works

  • ok_nick_2002 May 11, 2010

    so do we need to find this plug that unsnaps from the fan, hook a volt meter up, and then turn the thermostat up so that it turns on, and then see if i am getting the right amount of voltage to the fan, right?


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Induced Draft Motor Will Not Run

On furnaces with an induced draft motor, the motor must first come up to speed creating a negative pressure for the pressure switch. This switch must only be closed after the induced draft motor comes up to speed or the motor will not start. If this switch is jumpered (bypassed by the technician) prior to a call for heat the furnace unit will give an error code of “pressure switch contact failed in the closed position”. If the motor does not start check for induced draft motor wheel stuck or seized, lack of 115-volts to the induce draft motor, bad start capacitor on induce draft motor, defective inducer motor.

Posted on Oct 27, 2008

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Most forced draft fans are powered by 120 volts . close to the fan is usually a plug that unsnaps. create a call for heat after turning off to clear safetys and see if your getting 120 to fan on initial call for heat. if you are then fan draft motor is bad, usually sold as an entire assembly replace exact as it came out. sequence of operation is..... stat calls for heat via common and white wire to furnace , 24 volts. ......board sences call and sends 120 volts to forced draft ........ motor runs and creates pressure on proofing switch,....... switch closes 24 to board and tells it draft fan is on......... board then energizes ignitor,....... after ignitior glows gas valve is opened and burner lights ........ either ignitor or seperate sensor rod tells board the burner lit........ and a few minutes later the fan comes on and hot air is blown out. if a step is missed or doesn't proof the furnace either trys up to three times to light or locks out. turning off power usually resets safetys and it will resume attempts to lite normally.

Posted on Oct 26, 2008

  • Karen Duncan Oct 28, 2008

    the integrity of the flue and chimmney should be considered. with a lot of the new high efficiency furnaces and even some old 80 percent units the flue gases are cooler than they used to be and condensate up through the chimmney willcorrode the single wall pipe on a lot of them . we like to use 26 gage pipe for that reason and corrosion usually looks like white oxidation on pieces of pipe closest to the furnace. pipe up through the roof is usually double wall and you should look at the cap on the roof to see what its condition is . we want no water getting down the inside or outside of the chimmney and onto our motor. it can also be subject to water dripping down from a plugged ac drain during the summer. vacuum that out with a shop vac wet dry of course 2 times a year to keep clear.i have never oiled one of those motors but i suppose you could but most stuff like that is sealed. i usually replace the module (wheel and motor) to eliminate a call back and go on fixing something else rather than worrying about a recurrance. good luck


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Hi, I have a Goodman GMS80903BNA Furnace and recently what happens is that when the thermostat calls for heat the draft inducer motor starts. However, after this nothing seems to happen. I don't h

Youcould be loking at the pressure switch try jumping it out and see if it lights some times you can fool it in to working , check the hoses are tight and nor spilt or take a drill bit and just clean out the 2 ports where the hoses fit some times they get blocked , also check you air filter is clean and your fan

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