York Gas Furnace: TG9S/GY9S
Re: Flashing Code 11
This indicates that a primary or auxiliary 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 Blower Motor |
|
Bad Capacitor |
1 |
Broken Blower Wheel |
|
Bad Control Board |
|
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
- With a call for "Fan", check for 120VAC between "Neutral" and "HEAT", then "Neutral" and "COOL".
- No Power = Bad Control Board ⇒ It may be possible to hook a blower speed to the "EAC" terminal to get temporary fan operation.
- Power Present + No Blower Operation = Bad Motor, Bad Capacitor or Bad Wiring ⇒ Check motor temperature, capacitor and wiring.
4. Check Limits
- Check for 24VAC between both 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 wire on Pin#1 and the Red/Grn wire on Pin#7 of the 12-pin plug.
- No Power = Limit Closed
- Power Present = Limit Open