York Gas Furnace: YP9C
Re: Flashing Code 11
This indicates that a primary limit switch has opened and has remained open for more than five minutes. This condition is usually associated with an air circulation failure.
► Code 11 is a Hard-Lockout which requires cycling 24VAC power to the furnace board to reset (or cycling 115V power).
Qty |
Possible Causes: |
2 |
Bad V/S Blower Motor |
|
Broken Blower Wheel |
|
Bad Control Board |
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Bad Limit |
CHECKOUT:
1. Check Blower Motor/Wheel
- Turn off power to the furnace.
- Open the blower access door and check the condition of the blower wheel.
- Check to see if the motor and wheel turn freely.
2. Check Motor Operation
- Turn on power to the furnace.
- Energize a call for "Fan" by jumping "R" to "G".
3. Check Control Board/Motor
- At the blower motor power plug, check for 120VAC between "Blk" and "Wht".
- No Power = Broken/Loose Wiring or Bad Power Factor Choke
- Power Present + No Blower = Bad Motor or Bad Control Board (Most Likely the Motor)
4. Check Limits
- Check for 24VAC between sides of the primary limit and "C".
- Power on Both Sides = Limit Closed
- Power on One Side Only = Limit Open
- Limit Open + Cool Chamber = Bad Limit
- Alternatively, check for 24VAC between the Red/Grn wire on Pin#3 and the Red/Grn wire on Pin#6 of the 6-pin plug.
- No Power = Limit Closed
- Power Present = Limit Open