BoilerFaultCodesUnical 23 Fault Code
The Unical 23 fault code means: your boiler has detected that a button on the control panel has been held down for too long, which usually means a button is stuck or the panel is faulty.. It appears on 2 Unical models in our database.
Technical description: Detected tab panel button pressed for longer than 30 “
DIY fix possible
Check all buttons on the front control panel to see if any are physically stuck in the 'in' position.Gently press and release each button several times to ensure they click and spring back out.Clean the control panel with a dry microfiber cloth to remove any sticky residue or grit hindering the buttons.Reset the boiler by turning the power off and back on at the fused spur switch.
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Unical models that show the 23 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Unical 23 fault code information on this page is sourced and cross-checked against the official Unical service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026