E20
Rheem
Refrigerant Pressure / Heat Pump Protection Fault
Heater shows E20 and will not fire when set to heat pump mode (for hybrid models)
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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
Low refrigerant charge, Blocked condenser coil, Failed pressure switch, Faulty fan motor
How to Fix / Troubleshooting
Safety First: Disconnect power. Refrigerant systems must be serviced by EPA-certified technicians.
- Inspect condenser coil: On heat pump pool heaters, check the outdoor coil for dirt, leaves, or lint. Clean gently with a garden hose from inside out, avoiding high pressure that can bend fins.
- Check fan operation: Restore power briefly and call for heat. Ensure the fan starts and runs smoothly. If the fan does not run, turn power off and test the fan capacitor and motor. Replace as needed.
- Have refrigerant pressures checked: A qualified technician should connect gauges and verify operating pressures. Low charge or restrictions must be corrected professionally.
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Repair Difficulty
Professional Required
5/5
Required Part
Heat Pump Fan Motor
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