High
22E on Ravenheat Rsf

Your boiler has detected that the exhaust gases are getting too hot, so it has shut down as a safety precaution.

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

Flue sensor overheating

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.

Find a Gas Safe engineer
Search the official register →

Related fault codes

05EView →

Related guides you might find useful

Banging / kettling / whistling noise

Each noise points to a different fault.

Read →

Pilot light keeps going out

Older boilers — thermocouple, draught, gas supply.

Read →

Radiators cold at the bottom

Sludge build-up — needs flushing, not bleeding.

Read →