BoilerFaultCodesRavenheat E22 Fault Code
The Ravenheat E22 fault code means: your boiler has sensed that the exhaust gases are becoming too hot and has shut down as a safety precaution.. It appears on 9 Ravenheat models in our database.
Technical description: Flue sensor overheating
What causes the Ravenheat E22 fault?
This fault occurs when the internal temperature of the exhaust fumes exceeds safe limits, triggering a safety cutout to prevent damage to the plastic flue components. The most common reasons include a buildup of limescale or debris inside the main heat exchanger, which prevents heat from being transferred to the water effectively, or a faulty sensor sending incorrect readings to the control board.
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 E22 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ravenheat E22 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