F12
Aquacomfort
User Interface / Keypad Fault
F12 error; heater will not respond to external controls or local keypad.
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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
Failed keypad membrane, Damaged display board, Loose ribbon cable between UI and main board
How to Fix / Troubleshooting
Safety first: Turn off power before removing the front control panel.
- Inspect keypad and display: Look for signs of water intrusion, cracked display, or unresponsive buttons.
- Check ribbon cable: Carefully remove the front panel and reseat the flat ribbon cable or harness connecting the user interface to the main control board.
- Dry moisture: If condensation is present, gently dry the area and improve weather protection around the heater.
- Replace UI board: If F12 persists and buttons remain unresponsive, the user interface board or keypad assembly will likely need replacement.
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Repair Difficulty
Medium
3/5
Required Part
User Interface Board
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