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Blower motor on trane xv90 will not start

Customer Question
blower motor on trane xv90 will not start
Submitted: 12 months ago.Category: HVAC
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Customer reply replied 12 months ago
blinking diagnostic lights indicate normal status. motor leads (3) all have 10.9 ohms across them. replace the motor control module. no apparent burn marks on any of the circuit boards. which terminals to check to see if thermostat "fan on" call signal is arriving and how to check at the main board, or elsewhere, if 120v is being sent to the motor (cannot access the actual motor leads while mounted)?
Answered in 15 hours by:
9/23/2017
HVAC Technician: gotoman for ac, HVAC Technician replied 12 months ago
gotoman for ac
gotoman for ac, HVAC Technician
Category: HVAC
Satisfied Customers: 5,362
Experience: 51 years of experience install design and repair of all makes and models of AC
Verified

Did you remove module and ohm out the wires between all three. I have only replaced maybe 3 fan boards on Trane units. It is inhere motor,module or harness. Check connection on harness. Remove the harness and check the pins to see if they are corroded. Russ

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Customer reply replied 12 months ago
As I mentioned in my original post I have owned out the motor with all three leg pairs showing 10.99 ohms.
Customer reply replied 12 months ago
Also as I mentioned, I have installed a new motor module. No corrosion present in the harness. I have checked for 120 volts at the motor module and for a fan call on the main board terminals, terminal R and G. Feeling like the main board must be bad even though I'm getting no status light to that effect
HVAC Technician: gotoman for ac, HVAC Technician replied 12 months ago

24 volts between R and B correct. Russ

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