Electrical / blower problem

Old 12-20-22, 11:32 AM
Thread Starter
Join Date: Feb 2013
Location: USA
Posts: 12
Received 0 Upvotes on 0 Posts
Electrical / blower problem

I'm having a problem with my Bryant ('plus 80t') gas furnace. I noticed a problem so flipped the circuit breaker & reset the furnace to see what would happen:

- Furnace will ignite, and small external fan will kick on, but the blower motor & fan will not start or run in fan-only mode. There's an ominous hum and a faint electrical smell when it tries.
- Then the furnace shuts off and kicks over an error code for a "Limit Circuit Fault"
- The Nest thermostat reports power is out on R at this point

I have a tech scheduled to come tonight but a massive cold front arrives tomorrow and am concerned for what happens if there's no quick fix. Anyone have suggestions of things I can test or try in the meantime?

Thank you in advance!!
Old 12-20-22, 12:13 PM
Bob14525's Avatar
Join Date: Jun 2013
Location: USA
Posts: 1,552
Received 59 Upvotes on 50 Posts
As you mentioned, your blower isn't running, which is why the high limit switch is tripping. If your blower uses a PSC (Permanent Split Capacitor) motor, it may just be a bad capacitor. Look at the blower assembly. If you see a capacitor mounted on or near the blower housing, you have a PSC motor and it's worth trying a new capacitor. However, if you don't see a capacitor, you probably have an ECM (Electrically Commutated Motor). Unfortunately, the ECM's are very expensive (typically ~$1000).
guidoz voted this post useful.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: