York Gas Furnace: P3DH
Re: Flashing Code 5
Flashing Code 5 = Rollout Switch Open
Other symptoms associated with a Code 5:
- Blower and Inducer Running Continuous
- No Heat
| Qty | Possible Causes: |
| 1 | Rollout Switch Tripped |
| Bad Control Board |
CHECKOUT:
1. Check Rollout Switches
- Reset the furnace by cycling power.
- Start a call for heat by energizing "W".
- Monitor the LED on the furnace board for lockout indication.
- If board immediately goes into a Code 5, press the reset button on each Rollout limit and retry.
- Code 5 Goes Away ⇒ Check for Bad Heat Exchanger
- Still Code 5 → Step 2. Check Control Board
- If board immediately goes into a Code 5, press the reset button on each Rollout limit and retry.
2. Check Control Board
- At the control board 12-pin plug:
- Check for 24VAC between Pin# 11 (BRN) and "C".
- Check for 24VAC between Pin# 5 (BLK) and "C".
- Power on One Side Only = Open Limit Circuit ⇒ Check resistance across each roll-out switch.
- Power on Both Sides + Code 5 = Bad Control Board