Troubleshooting Trane Airhandler Blower Not Running

[bdamico]

Hi:

I have a 2006 air handler 2TEH3F24A1000AA with a x14 ac unit. The compressor runs but the blower does not run whether or not I turn the fan on the thermostat to run. The blower motor tries to kick on for a second and then reverses back and forth.

I replaced the Trane D154517P01 Electronic Fan Relay and it worked and all was well with the world--at least so I thought. The next day we are back to square one. Either by happenstance the fan relay I bought went bad in one day or there is any underlying problem that caused the first fan relay and the second fan relay to burn out and I'm not sure what it is and I didn't type in the right google search to find the answer. So other than buying a new motor (edit - I mean ecm) and another relay I'm stumped. Anyone have an idea? Any insight would be much appreciated

 

[samsjk]

tcheck the start capacitor or the run capacitor if one went bad it could cause an excessive amount of power going threw your relay. this will probably make your relay to melt internally or the fan fuse will blow


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[bdamico]

I'll check again (that was the first thing I looked for before I replaced the board) because now you have me second guessing but I thought there was no capacitor in this model

 

[mustangacman]

That is an ECM motor. Could have lost its programing or the module is bad.

 

[bdamico]

That is an ECM motor. Could have lost its programing or the module is bad.

Yep. To clarify your point of "could have lost its programming" are you suggesting anything other than just replacing the ecm--because that's all I can think of doing as a next step. Many thanks,

 

[bonneyman]

Something like 75% of all ECM failures are related to moisture damage to the module package on the back of the motor. The motors themselves will eat nails (according to one lecturer I listened to on the subject) - the modules are the weak point.

I was to the point where I would eliminate the ECM's altogether and replace them with regular PSC motors and a control package. But now I'm out of the business now, so.......