How much does it cost to fix Ravenheat error code 04?

Typical repair cost for the Ravenheat 04 fault is £90-180 including labour.

04 High

Ravenheat 04 Fault Code

Q: What does the Ravenheat 04 fault code mean?

Your boiler has sensed that it is getting too hot and has shut itself down to prevent damage or safety issues.

The Ravenheat 04 fault code means: your boiler has sensed that it is getting too hot and has shut itself down to prevent damage or safety issues.. It appears on 8 Ravenheat models in our database.

Technical description: Failed overheat – the overheat thermostat needs checking

What causes the Ravenheat 04 fault?

This fault occurs when the internal temperature of the boiler exceeds safe limits, triggering a safety sensor to cut off the burner. The most common reasons are a pump failure that stops water from circulating, or a blockage within the heat exchanger that prevents heat from being transferred away from the unit.

This issue is more frequent in autumn when heating systems are first turned on after summer, as pumps can seize during long periods of inactivity.

Typical repair cost £90-180 (including labour)

Engineer required

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

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Ravenheat models that show the 04 fault code

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

Source

Ravenheat 04 fault code information on this page is sourced and cross-checked against the official Ravenheat service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026