3 flashes
Inducer or pressure switch error
This code typically points to
- Blocked vent or intake
- Weak inducer or inducer failure
- Split or blocked pressure tubing
- Bad pressure switch
Next checks to confirm
- Verify inducer operation
- Inspect venting and pressure tubing
- Verify actual negative pressure during operation
Escalation
If draft proves good but switch never closes or behaves erratically, switch or board input becomes more likely.
Reset behavior
Stored in memory; auto-erased after 14 days.
Urgent
Fix now