Goodman Package Unit: GPG13
Re: Flashing Code 3
Code 3 = Pressure switch failed to open (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 3.
► A Code 3 may keep the inducer motor from starting on a call for heat.
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