BoilerFaultCodesChaffoteaux Overheat detection Fault Code
Also written as OVERHEATDETECTION — same fault.
The Chaffoteaux Overheat detection fault code means: your boiler has shut itself down because it detected that it is running too hot, indicating a potential circulation or sensor problem.. It appears on 2 Chaffoteaux models in our database.
Technical description: If an overheat is detected by the sensor (13), the grey security solenoid (30) and the blue 1/3 (31) closes, the orange indicator lamp (21) extinguishes. The ignitor is energised for 8 seconds and the red lockout indicator (22) lights.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Chaffoteaux models that show the Overheat detection fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Chaffoteaux Overheat detection fault code information on this page is sourced and cross-checked against the official Chaffoteaux service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026