BoilerFaultCodesFerroli DOMIcondens HE 26 C Fault Code
Also written as DOMICONDENSHE26C — same fault.
The Ferroli DOMIcondens HE 26 C fault code means: your boiler has detected that the exhaust gases are getting too hot, causing it to shut down for safety.. It appears on 4 Ferroli models in our database.
Technical description: F07
What causes the Ferroli DOMIcondens HE 26 C fault?
This fault occurs when the boiler's internal components become too hot because heat isn't being transferred away from the burner efficiently. The most common reason is a buildup of limescale or sludge inside the main heat exchanger, which acts like a barrier and causes the metal to overheat. It can also be triggered if the sensor responsible for monitoring these temperatures has failed and is 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 →Ferroli models that show the DOMIcondens HE 26 C fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli DOMIcondens HE 26 C fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026