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error Ideal
Error Code F4
Flow Thermistor Fault — flow temperature sensor malfunctions.
? What Causes This
Improper resistance values in the thermistor, connection breaks or wiring defects with the PCB.
✓ How to Fix It
- Check expected resistance levels for temperatures and replace faulty thermistors if found inconsistent readings.
- Review and repair wires between the thermistor and board connections for continuity and ensure no breaks/damage exist.
Source: page 54 of the official manual
From the manual
This error code appears in:
Ideal Boilers I 24