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

Typical repair cost for the Grant RED, GREEN blinking inverted fault is £150-300 including labour.

RED, GREEN blinking inverted High

Grant RED, GREEN blinking inverted Fault Code

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

Your boiler has detected an internal electrical issue affecting the fuel delivery system, which is preventing it from firing up safely.

Also written as REDGREENBLINKINGINVERTED — same fault.

The Grant RED, GREEN blinking inverted fault code means: your boiler has detected an internal electrical issue affecting the fuel delivery system, which is preventing it from firing up safely.. It appears on 5 Grant models in our database.

Technical description: Malfunction in the internal control circuit that drives the oil valve. Faulty oil valve; Internal control circuit that drives the oil valve faulty.

Typical repair cost £150-300 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Grant models that show the RED, GREEN blinking inverted fault code

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

Source

Grant RED, GREEN blinking inverted 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