How much does it cost to fix Warmhaus error code E 20?

Typical repair cost for the Warmhaus E 20 fault is £120-250 including labour.

E 20 High

Warmhaus E 20 Fault Code

Q: What does the Warmhaus E 20 fault code mean?

Your boiler has detected that the water inside the heating system has become dangerously hot and has shut itself down to prevent damage.

Also written as E20 — same fault.

The Warmhaus E 20 fault code means: your boiler has detected that the water inside the heating system has become dangerously hot and has shut itself down to prevent damage.. It appears on 1 Warmhaus model in our database.

Technical description: CH Overtemperature, Temperature > TSP 81 value °C

Typical repair cost £120-250 (including labour)

Engineer required

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

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Warmhaus models that show the E 20 fault code

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

Enerwa Repair: £120-250

Source

Warmhaus E 20 fault code information on this page is sourced and cross-checked against the official Warmhaus service / installation manuals for each affected model.

Warmhaus Enerwa manual (PDF)

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026