- Incorrect amount of refrigerant charge; system may be overcharged
- Faulty high pressure switch
- Incorrectly calibrated high pressure switch; sensor may need adjusted and reset to proper specs
- Blocked or restricted condenser airflow; condenser/radiator area or AC condenser fins are blocked causing poor heat dissipation which results in high pressures
- Faulty high pressure valve
- Excessive heat; outside temperature exceeds specified operating values (100F in most cases)
- Faulty compressor internal issue and is not operating properly; can happen with internal failure, leaking seals which causes the compression ratio within the system to fail or a worn/seized compressor causing excessive high side pressures.
