How much does it cost to fix Grant error code Amber neon?

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

Amber neon High

Grant Amber neon Fault Code

Q: What does the Grant Amber neon fault code mean?

Your boiler has stopped heating because the water pressure inside your radiator system has dropped too low to operate safely.

Also written as AMBERNEON — same fault.

The Grant Amber neon fault code means: your boiler has stopped heating because the water pressure inside your radiator system has dropped too low to operate safely.. It appears on 4 Grant models in our database.

Technical description: If the heating system water pressure falls below 0.2 bar the boiler low pressure cut-out switch will activate and an amber neon on the control panel will light.

Typical repair cost £80-150 (including labour)

DIY fix possible

Locate the external filling loop, which is a flexible silver hose connected to two valves under the boiler.Gradually open both valves to let water into the system while watching the pressure gauge.Stop opening the valves once the needle on the pressure gauge reaches the green zone, typically between 1.0 and 1.5 bar, then tightly close both valves.

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Grant models that show the Amber neon fault code

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

Source

Grant Amber neon 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