BoilerFaultCodesUnical 23 Fault Code
The Unical 23 fault code means: your boiler has detected that a control button has been stuck or held down for too long, which usually happens if a button is physically jammed.. It appears on 2 Unical models in our database.
Technical description: Detected tab panel button pressed for longer than 30 “. Check keypad and reset the status of the buttons. Or replace the electronic board
DIY fix possible
Locate the control panel on the front of your boiler.Firmly press and release each button several times to ensure none are physically stuck or jammed in the depressed position.Switch the boiler off at the fused spur or mains supply, wait for 30 seconds, and turn it back on to reset the system.
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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 31 August 2026