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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Have a tempstar 2008 MVP furnace. Condenser comes on for ac

Customer Question

Have a tempstar 2008 MVP furnace. Condenser comes on for ac call to cool but the indoor blower motor will not energize.
JA: Did you check the furnace's filters?
Customer: yes ok ,getting 4 lies on diagnostic board
JA: Do you plan on doing the work yourself?
Customer: yes have entire blower unit remove, have 120 volts connected to main board and cant get 24 volt reading across R&C thermostat terminals.
JA: Anything else we should know to help you best?
Customer: Tempstar fault codes? Trying to get 24 v to green terminal to energize fan relay.
Submitted: 3 months ago.
Category: HVAC
Expert:  Phil replied 3 months ago.

Hello, since the outside unit runs, we know for sure that the 24vac transformer is OK, and that the thermostat works... if the thermostat works that can only happen if you have 24vac reading between R and C.... therefore you are having a test meter issue, perhaps bad contact with the test probes.... or the meter is set on 24vDC

so far it sounds like a bad printed circuit board at the indoor unit... 90% chance of that.

OR... a bad fan motor or fan motor run capacitor if it has one....10% chance... feel the fan motor, it its hot that would be the problem.

if its not hot to the touch, then its most likely a printed circuit board problem

Expert:  Phil replied 3 months ago.

Thats the best 'just an answer' available. if you would like 48 hours of coaching and training on this, and a phone call up to 2 hours long, that will be faster. Usual cost is $25.... but for you I will submit an offer for only $5 (thats 10 cents an hour if you think its worth it let me know)