F20
Nirvana
Configuration / EEPROM Fault
F20 error; heater may indicate internal memory or configuration corruption.
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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
Corrupted control board memory, Power surge damage, Incorrect firmware, Failing main control board
How to Fix / Troubleshooting
Safety first: Turn off power before handling the control board.
- Power reset: Turn off the breaker to the Nirvana heater for at least 5 minutes to fully discharge the control. Restore power and see if F20 clears.
- Factory reset: Access the service menu and perform a factory default reset if available. Re-enter configuration parameters (gas type, altitude, etc.) according to the installation manual.
- Surge protection: If F20 occurred after a storm or outage, consider installing a surge protector on the heater circuit.
- Board replacement: Persistent F20 usually indicates a failing Nirvana main control board. Replace with an OEM board programmed for your model.
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Repair Difficulty
Hard
4/5
Required Part
Nirvana Main Control Board
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