How much does it cost to fix Grant error code Heating system?

Typical repair cost for the Grant Heating system fault is £0-120 including labour.

Heating system High

Grant Heating system Fault Code

Q: What does the Grant Heating system fault code mean?

Your boiler has stopped working because the water pressure in your radiators has dropped too low.

Also written as HEATINGSYSTEM — same fault.

The Grant Heating system fault code means: your boiler has stopped working because the water pressure in your radiators has dropped too low.. It appears on 1 Grant model in our database.

Technical description: Check the heating system water pressure

Typical repair cost £0-120 (including labour)

DIY fix possible

Locate the metal braided filling loop underneath or near the boiler.Slowly open the valve (or valves) until you hear water flowing and the pressure gauge rises.Close the valves firmly once the pressure gauge reaches 1.5 bar.

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Grant models that show the Heating system fault code

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

Vortex Blue Repair: £0-120

Source

Grant Heating system 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