E22
Pentair
Internal Control Board Fault
Heater shows E22 and will not start; may occur after a surge or lightning event.
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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
Damaged main control board, Surge or lightning damage, Corrupted firmware, Shorted low-voltage component
How to Fix / Troubleshooting
Safety: Turn off power at the breaker before opening the control compartment.
- Inspect board visually: Look for burn marks, swollen components, or corrosion on the main control board.
- Check for moisture: Ensure the control area is dry. Address any water intrusion issues (gaskets, covers) before replacing electronics.
- Disconnect peripherals: Temporarily disconnect non-essential low-voltage accessories (remote sensors, RS-485, etc.) and power up to see if E22 clears, which may indicate an external short.
- Replace control board: If the fault persists and the board shows signs of damage or fails basic checks, replace the main control board with the correct Pentair part number.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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