F14
Ideal
External Control / Thermostat Input Fault
Display shows F14, heater may not respond to thermostat or programmer.
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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
Open-circuit room thermostat, Faulty cylinder thermostat, Incorrect wiring on control terminals, Faulty external controls
How to Fix / Troubleshooting
Safety: Isolate power before accessing wiring terminals.
- Check programmer/thermostat: Ensure the external programmer is calling for heat and the room/cylinder thermostat is turned up above room temperature.
- Inspect wiring centre: At the heater's low-voltage control terminals, verify that the thermostat wires are secure and not broken.
- Temporary link test (qualified persons only): A competent person may fit a temporary link across the call-for-heat terminals to confirm the heater responds. Remove the link immediately after testing.
- Replace faulty controls: If the heater works with a link but not with the existing controls, the external thermostat or programmer likely needs replacement.
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Repair Difficulty
Medium
3/5
Required Part
Room Thermostat / Cylinder Thermostat
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