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.

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.

Grant Blinking RED Fault Code: What It Means & How to Fix It

What the manual says

Manufacturer manual

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.

From this model's manual

Verified against the Grant/Grant Vortex Eco installation & service manual.

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 →

Boiler cover options

Avoid the next call-out bill

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

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Related fault codes

LockoutView →

All 77 fault codes on the Vortex Eco

Seeing a different code? Every code this model can display, in one place.

10 12 18 21.0 22 26.0 31 36 36.0 44 54 61 69 92 116 143 198 232 286 348 396 429 594 727 728 729 A1.2 A1.3 A2.2 A3.2 BURNER indicator flashing BURNER indicator Slow flash Burner lock-out BURNER Slow flash CH PUMP Fast flash CH PUMP indicator Fast flash CH PUMP indicator Slow flash CH PUMP Slow flash Constant RED DHW PUMP (FLASHING)DHW PUMP Fast flash DHW PUMP indicator Fast flash DHW PUMP indicator FLASHING DHW PUMP indicator Slow flash DHW PUMP Slow flash Fast flash Flashes red Flashes red/green GREEN GREEN blinking GREEN blinking (0.5s)GREEN ORANGE blinking (0.5s)GREEN, RED blinking Green/Red flashing LED off Lock-out Lock-out (light on)Lockout Lockout button lit LOW PRESSURE LOW PRESSURE indicator lit OFF ORANGE ORANGE blinking Overheat Overheat thermostat RED RED blinking RED blinking (0.5s)RED fast blinking RED fast blinking (0.2s)RED flashing (Reset button)RED steady ON RED, GREEN blinking inverted RED, ORANGE blinking inverted Slow flash

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

What the manual says

Engineer required

Avoid the next call-out bill

Related fault codes

All 77 fault codes on the Vortex Eco

Related guides you might find useful

Banging / kettling / whistling noise

Boiler won't turn on — 9-step checklist

Boiler keeps cutting out

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