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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22675
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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Rheem indoor air handler. RHLL-HM3617Ja sometimes the

Customer Question

Rheem indoor air handler. RHLL-HM3617Ja sometimes the outdoor compressor runs but the indoor blower does not. I have 240 thru the units breaker and 24 v thru the transformer. I'm ready to replace the board but this AM the motor WAS running on low and "thumping" like it might have wanted to change to high speed. Now I'm wondering if the high speed part of the motor is bad. I do not see any external start capacitor. Motor or board?
Submitted: 2 years ago.
Category: HVAC
Expert:  BillyHvac replied 2 years ago.
What model number motor is in this unit? Original or changed since install?
Or how many wires attach to motor?
Customer: replied 2 years ago.
X13 FM19
1/2 hp 230 VAC
Motor dated 7/3/13
A/C installed 2010 so it must not be original
I count 6 wires into the motor. I have pictures that I can email.
To clarify, outside motor/compressor OK. Outside line cold. This AM as usual outside fan & compressor running OK, inside air handler motor thumping trying to start. Turned thermostat to OFF but left everything powered. 15 minutes later turned thermostat back on and motor went into high speed. It will probably be OK for rest of day until tomorrow morning again.
Expert:  BillyHvac replied 2 years ago.
Ok thats what I thought. A thumping or pulsing motor is a sign of an issue with a variable speed motor.
Before we go further I want you to get familiar with this type of motor.
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