Boiler shows A08, flow NTC fault, boiler may not regulate heating temperature.

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.

Possible Causes

Defective flow NTC, Poor contact with pipe, Wiring fault, PCB sensor circuit failure

Safety: Allow boiler to cool and isolate power.

Check mounting: Ensure the flow NTC is tightly clipped to the pipe or inserted in its pocket with thermal paste if specified.
Test sensor: Measure resistance and compare to Immergas chart. Replace if faulty.
Check harness: Repair any damaged wiring and reseat connectors.
Replace PCB: If sensor and wiring are good, PCB replacement may be necessary.

Medium 3/5

Flow NTC Sensor

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