F1
Giant
User Interface / Keypad Fault
F1 fault code on display, water heater unresponsive to temperature adjustments
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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
Stuck or shorted keypad button, Moisture intrusion into control panel, Damaged display board ribbon cable, Failed user interface board
How to Fix / Troubleshooting
Safety first: Disconnect power before removing any control panel covers.
- Inspect front panel: Check for signs of water drips or condensation on the Giant control panel. Dry the area thoroughly.
- Check buttons: Press each button several times to see if any are stuck or feel different. Do not use sharp objects.
- Open control housing: Remove the screws securing the front display panel. Inspect the ribbon cable between the display and main control board for damage or loose connections.
- Dry and reseat: If moisture is present, gently dry the board and connectors with a clean cloth and allow to air dry fully. Reseat the ribbon cable.
- Replace UI board: If F1 persists, the Giant user interface/display board is likely defective and should be replaced. Handle electronic boards with care to avoid static damage.
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Repair Difficulty
Medium
3/5
Required Part
Giant User Interface Board
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