Payne 90 plus starting issues


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Old 12-19-12, 11:28 AM
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Payne 90 plus starting issues

Join Date: Aug 2011
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Payne 90 plus furnace no start

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Just started this week. Furnace will work very intermittently.

When I turn it on either it will work or I can hear the smaller blower motor running but the big motor will not turn on. Also heard some sharp crackling noises (more on this shortly)

Things I have done - took the upper & lower cover. Checked to see if the reset button was tripped - was not. Reinstalled the lower cover and then manually held in the safety switch. The big blower turned on immediately and after reinstalling the cover (thus closing the safety switch) the blower works okay. The air temp from the vents is cool however. Sometimes it will start blowing warm air just fine. Will heat just fine then the temp starts dropping again and if you listen to the furnace you can hear the smaller motor running and seems like the furnace is trying to ignite.

Do not see any issues with water contamination although it has been raining pretty hard. However if it was a water issue blocking the vent I would suspect i would never kick in.

I read that there are some self diagnostic you can do on the circuit board and also see a label showing how to initiate it. Should I try this first?

Also this is equipped with an electronic air cleaner. When I held the safety switch in I could see arcing from the romex cable to the furnace housing. Turning off the electronic air cleaner (has a shut off switch) and arcing goes away. not sure if we are dealing with a bad heater or just shorted wiring.

Thank you for any ideas and suggestions. With work being very slow spending a lot of money on this is simply not in the Winter budget at this time.
 
  #2  
Old 12-19-12, 02:36 PM
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Describe in detail the sequence of events which occurs when you turn up the thermostat.
 
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Old 12-19-12, 08:01 PM
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What happens

Okay found an awesome event list here on the website.

1- Turn on heater
2- Inducer Blower kicks in - verified blower is turning on
3- Contact inside pressure switch close - not sure how to verify this but am assuming this happening as the next steps work.
4- Can verify ignitor getting red after 10 or so seconds burner lights (the one under pilot)
5- Here is where I think it is failing - the voltage at the gas valve when it gets supplied voltage varies anywhere between 14-21 volts not a solid 24 volts. The interesting part of this is when the furnace is running and working I checked the voltage and it was the same 14-21. And when I say 14-21 it would fluctuate up and down. When the furnace does not fire up the flames are still at the base by the ignitor but the large fan does not engage)

I also ran the self test on the circuit board and it appeared to turn on everything as it should.

So does this mean we are dealing with a bad control board or is the voltage acceptable and requires a gas valve? I again am assuming that the gas valve is sticking and not allowing the gas to get to the main burner.

Thanks again
 
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Old 12-19-12, 09:37 PM
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Unusual to see that voltage vary like that. Are you sure your meter is on AC volts ?
 
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Old 12-19-12, 10:37 PM
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Update

DOH! I suppose the meter should be on AC! Will test that again tomorrow and report back.

Meanwhile 2 more things to report.

There was a cannister with a larger clear plastic tube that went to a plastic housing with another smaller hose coming from the inducer blower housing into it. The line was full of water - took off the hose and found the cannister plugged with debris. Cleaned it out and drained all the water I could find. Did not help but I am assuming this is the water drain from condensation?

Also when the furnace was trying to start i lightly tapped on the gas valve and it turned on. Ever since that the furnace has worked. Also will let you know if this holds true tomorrow when I recheck the voltage
 
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Old 12-20-12, 12:22 PM
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>



A plugged drain will cause the pressure switch to stay open and prevent the ignitor and burners from turning on.

So cleaning out this sdrain trap, which tends to get plugged with mold sometimes is a good thing to repair!

I'm surprised the furnace was running at all.
 
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Old 12-20-12, 02:01 PM
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Agreed. I could not blow through the canister at all - cleaned it thoroughly and reinstalled.

Perhaps the gas valve was just coincidence but the furnace is working veryw ell now.


Thanks for the help!
 
 

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