Furnace blower runs non stop

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Plumber69

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Non of the limits are tripped. Even runs with all thermostat wires disconnected. Tried new board same thing. Only thing I can think of is a bad ecm. Anyone come across this
 

WorthFlorida

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Fitter30

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There should be a motor check out in service manual just google brand and model# if no luck brand and model of motor and post them.
 

Plumber69

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Did you disconnect the control wires to the ECM motor? I hate those motors. For the most part you cannot get the back part of the ECM motor. After GE sold the motor division to GENTEQ years back. You might want to consider this tool for your bag of tricks.

https://www.supplyhouse.com/Supco-E...cFBAiZW2HjsJ1JOdox2ou-gWhE5AJvkRoC79wQAvD_BwE
You mean the low voltage harness off the ecm? If it still runs means bad ecm? I've been reading of some people removing high voltage harness off ecm and it still runs.
The way I understand it is the low voltage harness is just telling ecm which speed to run and the high voltage provides power
 
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