How much does it cost to fix Grant error code Blinking RED?

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

Blinking RED Medium

Grant Blinking RED Fault Code

Q: What does the Grant Blinking RED fault code mean?

Your boiler has detected that it is running too hot and has automatically slowed itself down to prevent any damage to its internal components.

Also written as BLINKINGRED — same fault.

The Grant Blinking RED fault code means: your boiler has detected that it is running too hot and has automatically slowed itself down to prevent any damage to its internal components.. It appears on 5 Grant models in our database.

Technical description: Thermal self-protection mode. The fluid temperature exceeds the maximum value at a specific ambient temperature. The pump will automatically reduce power consumption, speed, and performance.

Typical repair cost £120-250 (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 Blinking RED fault code

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

Source

Grant Blinking RED 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