1780 High

Warmworld 1780 Fault Code

The Warmworld 1780 fault code means: your boiler has detected that the water inside the system has reached an excessively high temperature and is shutting down to prevent damage.. It appears on 1 Warmworld model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: 70°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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Warmworld models that show the 1780 fault code

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

Source

Warmworld 1780 fault code information on this page is sourced and cross-checked against the official Warmworld service / installation manuals for each affected model.

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