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

Typical repair cost for the Grant ORANGE fault is £150-300 including labour.

ORANGE High

Grant ORANGE Fault Code

Q: What does the Grant ORANGE fault code mean?

Your boiler’s electrical supply is unstable, meaning the electricity coming from your home is not consistent enough for the boiler to operate safely.

The Grant ORANGE fault code means: your boiler’s electrical supply is unstable, meaning the electricity coming from your home is not consistent enough for the boiler to operate safely.. It appears on 5 Grant models in our database.

Technical description: Frequency supply error

Typical repair cost £150-300 (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 ORANGE fault code

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

Vortex 15-20 Repair: £150-300
Vortex 20-26 Repair: £150-300
Vortex Eco Repair: £150-300
Vortex Eco External Floor Standing Repair: £150-300
Vortex Pro 15-26 Repair: £150-300

Source

Grant ORANGE 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