BoilerFaultCodesRavenheat 22E Fault Code
The Ravenheat 22E fault code means: your boiler has detected that the exhaust gases are becoming too hot and has shut down as a safety precaution.. It appears on 7 Ravenheat models in our database.
Technical description: Flue sensor overheating
What causes the Ravenheat 22E fault?
This fault occurs when the internal temperature of the exhaust pipe exceeds safe limits, triggering an emergency shutdown to prevent damage to the plastic flue components. The most common reason is a buildup of limescale or debris inside the heat exchanger, which prevents heat from being transferred to the water and sends it out through the chimney instead. In some cases, it can also be caused by a faulty sensor sending an incorrect high-temperature reading to the main control board.
This fault often becomes more apparent during winter when the boiler is running at maximum capacity for long periods to heat a cold home.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Ravenheat models that show the 22E fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ravenheat 22E 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