29L
High Refrigerant Pressure Lockout
This code typically points to
- High-pressure control opened three times in same call
- Excessive refrigerant charge
- Failed indoor blower motor
- Dirty return filter
- Dirty indoor coil in heating
- Failed outdoor motor
- Dirty outdoor coil in cooling
Next checks to confirm
- Evaluate cause of high-pressure condition
- Inspect charge, indoor airflow, outdoor fan, and coil cleanliness per operating mode
Escalation
After HPC opens 3 times during same call, UODC locks compressor out and Control Center displays high-pressure lockout
Reset behavior
Manual reset only — disconnect electrical power to both indoor and outdoor units for 1 minute, then restore power.
Urgent
Fix now