2 red flashes
Pressure switch closed with inducer pressure below setpoint (switch closed when it should be open)
This code typically points to
- Bad pressure switch
- Bad pressure transducer
- Misread proofing state
Next checks to confirm
- Verify transducer/switch agreement
- Check startup condition
- Compare transducer reading to switch behavior
Escalation
Transducer/switch disagreement indicates sensor or board issue.
Reset behavior
Clears when startup proofing is normal.
Urgent
Fix now