BoilerFaultCodesUnical 38 Fault Code
The Unical 38 fault code means: your boiler's computer memory has been scrambled by electrical interference, which can usually be fixed by simply resetting the system.. It appears on 2 Unical models in our database.
Technical description: FACTORY PARAMETERS Alteration of the factory parameters due to possible electromagnetic interferences. Press the unblock key; if the anomaly persists, replace the board.
DIY fix possible
Locate the unblock or reset button on your boiler's control panel.Press and hold the reset button for a few seconds to clear the error.If the boiler does not reset, turn the power off at the fused spur, wait one minute, and turn it back on.
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Unical models that show the 38 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Unical 38 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