Electrical / blower problem
#1
12-20-22, 11:32 AM
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!!
Guido
- 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!!
Guido
#2
12-20-22, 12:13 PM
Member
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.
