Faulty sensor Medium

Johnson Starley Faulty sensor Fault Code

Also written as FAULTYSENSOR — same fault.

The Johnson Starley Faulty sensor fault code means: your boiler's control panel has lost communication with a temperature sensor, which is preventing it from heating your home correctly.. It appears on 1 Johnson Starley model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: PCB is not seeing sensor. Confirm by measuring sensor resistance. Replace sensor if resistance is greater then 28K.
Typical repair cost £120-220 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Johnson Starley models that show the Faulty sensor fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Johnson Starley Faulty sensor fault code information on this page is sourced and cross-checked against the official Johnson Starley service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026