York Gas Furnace: YP9C
Re: Blowing SSU Fuse / Tripping Breaker
The furnace either blows the SSU high voltage fuse or trips the breaker when power is applied.
| Qty |
Possible Causes: |
| 2 |
Bad Blower Motor |
|
Bad Control Board |
|
Shorted High Voltage Wires |
|
Bad Breaker |
CHECKOUT:
1. Check Inlet Power Wires
- Turn off power to the furnace at the breaker.
- Remove the fuse from the SSU switch.
- Test resistance of the fuse with a multi-meter.
- Remove the SSU switch from the junction box.
- Check for any burnt wires or arc spots.
- Repair wiring if necessary.
- Be sure to apply electrical tape around the bare wiring connections.
2. Check Control Board
- Open necessary control panels to access the furnace control board.
- Inspect the control board and wiring for indications of burning or electrical arcing.
3. Check Blower Motor
- Remove the high voltage plug from the ECM motor.
- Look for signs of electrical arcing around the motor terminals.
- Leave the high voltage plug un-plugged from the motor.
- Leave the SSU turned off and re-apply power by turning the breaker back on.
- Turn the SSU switch back on.
- Fuse Blows or Breaker Trips = Bad Control Board or Shorted High Voltage Wires
- Fuse & Breaker OK = Bad Blower Motor or Bad Breaker --> Confirm with the following:
- Turn off power to the furnace.
- Re-attach the high voltage plug to motor.
- Re-apply power to the furnace.
- Fuse Blows or Breaker Trips = Bad Blower Motor