9 red flashes / green ON
High-pressure switch fault with no communication for compressor operation and Y1/Y2 not energized
This code typically points to
- Abnormal HPS event outside active compressor command
Next checks to confirm
- Verify wiring/communication state
- Verify HPS circuit
Escalation
Indicates wiring or pressure issue outside normal operation.
Reset behavior
Depends on actual condition.
Urgent
Fix now