9 Flashes
High-pressure switch stuck open
This code typically points to
- High-pressure switch not closing
- Inducer performance, vent restriction, or tubing issues
Next checks to confirm
- Verify high-fire proving path during high-stage transition
- Inspect tubing and venting
Escalation
Escalate to inducer/vent draft diagnosis if switch remains open.
Reset behavior
Retries after correction.
Urgent
Fix now