20 Most Recent Coleman Intertherm Nordyne Miller Furnace Control Board 904531 Questions & Answers

Have you had chimney/stack checked for any obstructions, so air can flow through and out properly. Also have gas pressure checked and burner cleaned.

Coleman... | Answered on Oct 12, 2017

That is probably normal if it is electric heat to slow the air over the heating elements. Even some gas units do this. Check to see if the unit blower motor has wires for multiple speeds.

Coleman... | Answered on Jan 15, 2015

this is normal operation for the fan in heat mode.

Coleman... | Answered on Oct 25, 2013

did you check the hose from the inducer to the pressure switch? HAVE you unplugged the unit from the wall outlet to reset the board? DO you have a voltmeter? If you do you can run voltage across the switch and if you get 24 volts you are open.

Coleman... | Answered on Oct 24, 2013

Contact Coleman directly to request the wiring diagram (not a schematic).

Coleman Heating... | Answered on Dec 26, 2020

the motor may have too much play as indication of worn bearings,
and besides, the capacitor may be bad, the cause for not startng up, oil.

Coleman Heating... | Answered on Oct 17, 2020

If you are hearing humming from the motor itself, replace the capacitor. Should only cost you $10-20.

To rule out a faulty thermostat perform a jump test on the control board. There's a lot of videos and tutorials online for performing a jump test. I attached one of them for your reference, however with the humming, I am inclined to believe it is a faulty capacitor.

Coleman Heating... | Answered on Sep 29, 2020

showing no ac voltage possible compressor over heating or capacitors opening and blocking ac voltage

Coleman Heating... | Answered on Aug 25, 2020

If it's tripping, you've got a short, probably water where it doesn't belong. Unplug and inspect the unit. Hopefully you'll find a bad or missing seal.

Coleman Heating... | Answered on Oct 26, 2019

i don't know. it may be your blower or your motor that needs to be inspecvted. be very careful. shut off power to furnace. turn thermostat to lowest setting. shut off circuit breaker for furnace or remove fuse for furnace. open blower panel; and pull drive belt [ i f furnace has one ]
that turns the blower. if it turns, the blower is OK i suspect the motor needs repair. https://www.repairclinic.com/RepairHelp/Furnace-Repair/36-383--/Coleman-Furnace-Troubleshooting
see your symptoms and click on 'see video' at right of
" Furnace blower not running ".........

Coleman Heating... | Answered on Oct 26, 2019

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