HP
Certikin
High Refrigerant Pressure (for Certikin gas heat pump pool heaters)
Display shows HP (High Pressure) and heater shuts down.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Blocked air flow across condenser coil, Overcharged refrigerant circuit, Faulty high-pressure switch, Fan not running on Certikin heat pump unit
How to Fix / Troubleshooting
Safety first: Isolate electrical power. Refrigerant systems must only be serviced by F-gas certified technicians.
- Check airflow: Ensure there is at least the minimum clearance around the Certikin heat pump and that nothing blocks the air intake or discharge.
- Clean condenser coil: Gently hose down the outdoor coil to remove dust, leaves, and debris. Do not use high-pressure jets that can damage fins.
- Verify fan operation: Restore power briefly and observe whether the fan starts when the unit runs. If not, switch off immediately.
- Reset: Some models have a manual reset high-pressure switch accessible behind a panel; only reset once after resolving airflow issues.
If HP recurs, a refrigeration engineer must check refrigerant charge and system pressures.
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Repair Difficulty
Professional Required
5/5
Required Part
Certikin heat pump high-pressure switch / condenser fan
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