57
Pressure switch stuck open when should be closed
This code typically points to
- Pressure switch not proving
- Inducer/draft issue
- Tubing restriction
- Vent restriction
Next checks to confirm
- Check inducer proving, switch closure, venting, hoses, and wiring
Escalation
If low-pressure switch fails to close after 60 seconds of inducer operation, five-minute soft lockout applies on this control generation
Reset behavior
Automatic reset after five minutes if five-minute soft lockout occurred.
Urgent
Fix now