14
Biasi
Room Thermostat / External Control Fault
Error 14; unit may not respond to thermostat or control signals.
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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 external control wiring, Incorrect control settings, Faulty PCB input
How to Fix / Troubleshooting
Safety: Isolate power before working on control wiring.
Steps:
- Check external controls: Ensure the room thermostat or programmer is calling for heat (set temperature higher than room temperature, ensure timers are on).
- Inspect wiring: At the heater's control terminals, verify that the thermostat wires are secure and not corroded.
- Bypass test (qualified persons only): Temporarily link the room thermostat terminals at the heater to simulate a call for heat. If the heater starts, the external control or its wiring is faulty.
Warning: Only competent persons should perform bypass tests, and links must be removed after testing. Incorrect wiring can damage the PCB.
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Repair Difficulty
Medium
3/5
Required Part
Room Thermostat / Control Wiring
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