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Discussion Starter · #1 ·
Last summer our air went out in our newly purchased home, the company that installed the York unit came out and replaced the ECM on the blower motor....$700. Air worked great all summer. When it was time for heating we used our pellet stove which has a separate thermostat which turns on the stove and the central blower motor...although that wasn't working all the time. So we turned the fan switch on the HVAC thermostat to the 'On' position, the fan turned on and then we smelled burning electronics and turned off the fan and power to the HVAC.
This summer we had a different HVAC company come out and check the system. We turned it on with the fan set to 'Auto' and the ac worked....we switched the fan to 'On' so the tech could see and it finished burning out our one year old ECM!
Does anyone have an idea what happened? Thanks
 

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Discussion Starter · #3 ·
Thanks for your reply....why would the blower run until switching the fan to 'On' and then fry? What do you think might have happened? Thanks
 

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Getting a signal to run at low speed/continuous mode will not kill an ecm -> probably had underlying problem and just happened to die right at that point.
 

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Discussion Starter · #5 ·
Getting a signal to run at low speed/continuous mode will not kill an ecm -> probably had underlying problem and just happened to die right at that point.
We have put the $500 part onto the motor and into the HVAC....just scared of plugging it back in and frying it again. Thanks for helping.
 

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Did you do this repair yourself?
If a call for continuous fan cooks the ecm, something upstream is wrong.
 

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Discussion Starter · #7 ·
OK....plugged everything up and turned on the HVAC, the fan did not turn on...is there a reset switch/button somewhere?
 

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What part did you change.
 
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Was any troubleshooting done to determine if the motor windings were still good and if the controller was getting both line voltage and signal.

The version of ecm can determine troubleshooting method.
 

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Did you get an OEM module preprogrammed. Or buy one off ebay or similar site.
 
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Discussion Starter · #13 ·
Was any troubleshooting done to determine if the motor windings were still good and if the controller was getting both line voltage and signal.

The version of ecm can determine troubleshooting method.
There was a visual inspection of the motor at the York dealer....no troubleshooting on the line voltage and signal yet. Will be working on that this evening hopefully.
 

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Discussion Starter · #16 ·
My father-in-law just told my wife that there is a delay when turning on the air before the fan comes on...is this true, and if it is how long of a delay. We shut off power when the fan didn't start out of fear that the emc would fry again.
 

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Can be up to 30 seconds before the blower comes on.
 
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I couldn't find a PU9C on York's portal. Could it be a PV9C16N080UP11*?

Cheers!
So you can Cheech against what you Recieved and for further troubleshooting if required. 15-30sec delay is normal

S1-024-31947-027 - ECM with control
(now S1-324-36074-293)

S1-32436080293 - control programed

S1-024-35314-000 - control unprogrammed
(now S1-024-36080-000)

It should be a ECM 2.3 / EON control.

Cheers!
 
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