How much does it cost to fix Grant error code PROBE FAULT?

Typical repair cost for the Grant PROBE FAULT fault is £150-250 including labour.

PROBE FAULT High

Grant PROBE FAULT Fault Code

Q: What does the Grant PROBE FAULT fault code mean?

Your boiler has lost the signal from one of its internal temperature sensors, which is preventing it from heating your home safely.

Also written as PROBEFAULT — same fault.

The Grant PROBE FAULT fault code means: your boiler has lost the signal from one of its internal temperature sensors, which is preventing it from heating your home safely.. It appears on 1 Grant model in our database.

Technical description: Probe fault is scrolling across the bottom of the burner control panel display. This may be due to plugs not being correctly fitted to the burner.

Typical repair cost £150-250 (including labour)

Engineer required

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

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Grant models that show the PROBE FAULT fault code

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

Spira Repair: £150-250

Source

Grant PROBE FAULT fault code information on this page is sourced and cross-checked against the official Grant service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026