BoilerFaultCodesWarmhaus E 02 Fault Code
Also written as E02 — same fault.
The Warmhaus E 02 fault code means: your boiler has stopped working because the water pressure inside your heating system has dropped too low to operate safely.. It appears on 1 Warmhaus model in our database.
Technical description: Low pressure in the CH system
DIY fix possible
Locate the filling loop (a flexible silver hose) underneath the boiler or near your heating pipes.Slowly open the valves on both ends of the loop until you hear water entering the system.Monitor the pressure gauge on the front of the boiler until the needle reaches the green zone (typically 1.0 to 1.5 bar).Close both valves tightly and ensure the pressure remains stable.
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Warmhaus models that show the E 02 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Warmhaus E 02 fault code information on this page is sourced and cross-checked against the official Warmhaus service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026