F12
Ideal
User Interface / PCB Communication Fault
Display shows F12, no response to demand for hot water or heating.
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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
Loose ribbon cable between display and main PCB, Faulty control panel, Failed main PCB communication circuit, Power supply instability
How to Fix / Troubleshooting
Safety: Isolate power before removing the front panel or control fascia.
- Check display connections: Remove the front control panel as per Ideal instructions. Inspect the ribbon cable or plug between the display and main PCB. Reseat firmly.
- Inspect for damage: Look for burnt components, corrosion, or signs of water ingress on the display board.
- Power cycle: Restore power and perform a full power cycle (off for 30 seconds, then on). Observe if F12 clears.
- Professional repair: If F12 remains, the display PCB or main PCB may require replacement and configuration by an Ideal-trained engineer.
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Repair Difficulty
Professional Required
5/5
Required Part
User Interface PCB
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