F.71 temperature sensor plausibility error; appliance may cycle rapidly or shut down

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

Flow NTC installed in wrong position, Air pocket around sensor, Poor thermal contact to pipe, Faulty NTC giving slow response

Safety: Turn off power and gas before accessing sensors.

Check sensor mounting: Ensure the flow NTC is correctly clipped or inserted into its pocket and in good contact with the pipe or heat exchanger.
Bleed system: Remove air from the system so that water properly bathes the sensor location.
Compare readings: Compare flow NTC readings with actual pipe temperature using a contact thermometer. Replace the NTC if it is significantly inaccurate or slow to respond.
Reset and test: After correction, reset the appliance and monitor temperature behaviour.

Medium 3/5

Flow Temperature NTC Sensor

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