How much does it cost to fix Grant error code 729?

Typical repair cost for the Grant 729 fault is £80-150 including labour.

729 High

Grant 729 Fault Code

Q: What does the Grant 729 fault code mean?

Your boiler is displaying an internal identification code rather than an active fault, indicating the system's computer may need to be reset or reconfigured by a professional.

The Grant 729 fault code means: your boiler is displaying an internal identification code rather than an active fault, indicating the system's computer may need to be reset or reconfigured by a professional.. It appears on 5 Grant models in our database.

Technical description: Product identifier for VTXBFCOMBI36

Typical repair cost £80-150 (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 729 fault code

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

Vortex 15-20 Repair: £80-150
Vortex 20-26 Repair: £80-150
Vortex Eco Repair: £80-150
Vortex Eco External Floor Standing Repair: £80-150
Vortex Pro 15-26 Repair: £80-150

Source

Grant 729 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