[b_lloyd83]

Hello All!

I have a furnace problem that I want an extra few opinions on. When I try to turn it on I'm getting 3 blinking lights, and on my troubleshooting manual this is "Pressure switch stuck open".

It is a Goodman GMH95 or GCH9

I have taken off all the hoses and blew/sucked through them multiple times, the switches seem to click open/close effortlessly on both pressure switches. I have also tried starting the system with the vacuume hoses unplugged.

I also blew out the PVC pipes with the air hose.

When I turn the system on, the relays will click on and then the fan motor (I think that's what it is) will humm and sometimes spin a little and sometime just turn ever so slightly. In the video below it will spin a little. The motor will get pretty warm in this short time. Manually spinning the black handle it will only turn about one rotation before stopping, shouldnt it spin fairly easily and keep a spin for quite a few rotation if I manually spin it?

Here is a video of the malfunction:

I'm thinking that motor is seized, am I on the right track? Thank you for taking the time to view this.

 

[b_lloyd83]

I should also note that I can spin the black wheel manually but it still will not stay spinning. The manually spinning seems to have quite a bit of resistance. Like said before, if I manually try to spin the black wheel as fast as I can, it will only complete about 1 full rotation.

 

[carmon]

Hello All!

I have a furnace problem that I want an extra few opinions on. When I try to turn it on I'm getting 3 blinking lights, and on my troubleshooting manual this is "Pressure switch stuck open".

It is a Goodman GMH95 or GCH9

I have taken off all the hoses and blew/sucked through them multiple times, the switches seem to click open/close effortlessly on both pressure switches. I have also tried starting the system with the vacuume hoses unplugged.

I also blew out the PVC pipes with the air hose.

When I turn the system on, the relays will click on and then the fan motor (I think that's what it is) will humm and sometimes spin a little and sometime just turn ever so slightly. In the video below it will spin a little. The motor will get pretty warm in this short time. Manually spinning the black handle it will only turn about one rotation before stopping, shouldnt it spin fairly easily and keep a spin for quite a few rotation if I manually spin it?

Here is a video of the malfunction:
https://www.youtube.com/watch?v=d9o6-zxVdiM

I'm thinking that motor is seized, am I on the right track? Thank you for taking the time to view this.

insure there is 115vac to the motor ….. if there is you need a new one. your on the right track

 

[b_lloyd83]

insure there is 115vac to the motor ….. if there is you need a new one. your on the right track

Am I touching the two wires with an OHM meter while it is buzzing? What setting should my OHM meter be on? As long as it has full power to it and it won't turn that means it is bad?

The big fan itself spins effortlessly. A slight turn and it will freely spin several rotations with no resistance, unlike the black wheel.

 

[beenthere]

If that motor is humming, its probably getting its 120 volts, and needs replaced. But checking for voltage with a meter first is always prudent.

 

[b_lloyd83]

If that motor is humming, its probably getting its 120 volts, and needs replaced. But checking for voltage with a meter first is always prudent.

What setting do I put my multimeter (OHM meter) on and am I touching just the two wires while it's humming? I always mix up AC/DC settings while using it.

 

[raylo32]

Set it to "AC Volts".

What setting do I put my multimeter (OHM meter) on and am I touching just the two wires while it's humming? I always mix up AC/DC settings while using it.

 

[ben's plumbing]

the inducer motor pulls the pressure switch in ..thats is why your getting the error code.....see if its filled with water ...have seen some traps clog....causing inducers to fill with water...also check for 120 volts at inducer leads while running if you have 120...motor bad...

 

[b_lloyd83]

the inducer motor pulls the pressure switch in ..thats is why your getting the error code.....see if its filled with water ...have seen some traps clog....causing inducers to fill with water...also check for 120 volts at inducer leads while running if you have 120...motor bad...

Is the Inducer Motor what is spinning the black wheel? I took off all the lines (Roughly 1/2 inch rubber lines, 2 of them) and blew them out with the air compressor.

All 4 of the vacuume lines I blew and sucked multiple times to make sure the pressure switches activated easily, and they did.

 

[ben's plumbing]

Is the Inducer Motor what is spinning the black wheel? I took off all the lines (Roughly 1/2 inch rubber lines, 2 of them) and blew them out with the air compressor.

All 4 of the vacuume lines I blew and sucked multiple times to make sure the pressure switches activated easily, and they did.

yes ..have to be careful those pressure switches are sensitive...if you have voltage.and its not clogged...looks like you have a bad inducer...