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error Ideal
Error Code F5
Return Thermistor Fault — fault within return water temperature sensor circuitry.
? What Causes This
Incorrect thermistor resistance measurements or wiring interruptions between it and the PCB.
✓ How to Fix It
- Confirm accurate readings from multimeter tests at specified temperatures and replace faulty components.
- Rectify wire connections that provide continuity issues causing communication problems with sensors.
Source: page 55 of the official manual
From the manual
This error code appears in:
Ideal Boilers I 24