High
OVERHEAT HIGH LIMIT on Johnson Starley Warmcair DW

Your boiler has switched itself off because it has become too hot and needs time to cool down safely.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

Heater has exceeded temperature limits. Requires wait for pump over-run and cooling before reset. Includes checks for overheat limit switch continuity, PCB replacement, pump/valve operation, and strainer/filter clarity.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Related fault codes

E01View →E02View →

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