2 Flashes
Low-pressure switch stuck closed
This code typically points to
- Pressure switch failed closed
- Tubing/wiring issue
- Switch not opening at call start
- Trapped condensate or misrouted tubing
Next checks to confirm
- Verify switch state before inducer start
- Inspect tubing and wiring
- Confirm switch opens as call begins
Escalation
Replace switch only after tubing/port/wiring checks.
Reset behavior
Clears when fault is corrected and call restarts.
Urgent
Fix now