What does the Johnson Starley FLOW THERMISTOR FAULT fault code mean?

Your boiler has lost the ability to accurately measure the temperature of the water flowing through it, so it has shut down to prevent damage.

How much does it cost to fix Johnson Starley error code FLOW THERMISTOR FAULT?

Typical repair cost for the Johnson Starley FLOW THERMISTOR FAULT fault is £120-200 including labour.

Manufacturer manual

Faulty flow thermistor or wiring/connection issues

From this model's manual

Verified against the Johnson Starley/Johnson Starley Quantec C installation & service manual.

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Boiler cover options

A cover plan would handle faults like FLOW THERMISTOR FAULT: no call-out fees, no surprise bills.

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