York Gas Furnace
Re: Flashing Code 2
(Assuming original control board)
Code 2 = Pressure switch stuck closed
The furnace pressure switch should only close when the inducer fan output is energized. If control board is not energizing the inducer fan output and the switch is closed, the board will flash a code 2.
► A Code 2 will typically keep the inducer motor from starting and the gas furnace from operating.
Qty | Possible Causes (From Most to Least Likely): |
1 | Bad Pressure Switch |
Inducer Fan Stuck On (Bad Control Board) | |
ADPS Switch Set Too Low |
CHECKOUT:
1. Check Controller
2. Check Pressure Switch Contacts
3. ADPS Switch Setting