BoilerFaultCodesUnical 44 Fault Code
The Unical 44 fault code means: your boiler has detected that the water pressure inside your heating system is currently set to an incorrect level.. It appears on 2 Unical models in our database.
Technical description: WATER PRESSURE detected if the pressure Transducer is present
DIY fix possible
Locate the filling loop (a flexible metal hose) underneath your boiler.Open the valves on the filling loop to allow cold mains water to enter the system.Watch the pressure gauge on the front of the boiler until it reaches 1.5 bar, then securely close both valves.
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Unical models that show the 44 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Unical 44 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