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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22678
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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Just replaced the blower motor on aH23Q5/6-150. Initializing

Customer Question

HI. Just replaced the blower motor on aH23Q5/6-150. Initializing shows 95VAC at heat lead* then drops to 0 when heat demand kicks in. Any ideas before I consider board bad?
FYI Old motor was tripping breaker.
Submitted: 2 years ago.
Category: HVAC
Expert:  BillyHvac replied 2 years ago.

hello, there is nothing else to consider as you have it narrowed down.

The board is what fried the old it is time to replace the board. Your test show 100% bad circuit board


Customer: replied 2 years ago.
I do see the 27VAC on heat & fan leads from thermostat when the motor heat lead reads both 95VAC (is that the giveaway?) AND when it drops to 0VAC (after 2 or 3 quick relay clicks)Not worth checking pressure (or other check switch/sensor)?
Expert:  BillyHvac replied 2 years ago.

not worth the time...the 27 is correct for thermostat voltage but the board is robbing voltage from the 120v.

Your end result is 100% new board