What does the Grant GREEN, RED blinking fault code mean?

Your boiler has detected an internal light source that shouldn't be there, so it has safely shut itself down to prevent ignition.

How much does it cost to fix Grant error code GREEN, RED blinking?

Typical repair cost for the Grant GREEN, RED blinking fault is £120-250 including labour.

Manufacturer manual

The burner does not start when there is heat demand. The UV sensor sees an extraneous light. Eliminate the extraneous light.

From this model's manual

Verified against the Grant Vortexblue Internal Combi Installer Uk Doc 0131 Rev 1 1 October 2020 installation & service manual.

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Boiler cover options

A cover plan would handle faults like GREEN, RED blinking: no call-out fees, no surprise bills.

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