BoilerFaultCodesWarmhaus rE02 Fault Code
Also written as RE02 — same fault.
The Warmhaus rE02 fault code means: your boiler has detected that the water pressure in the system is too low or the pressure sensor settings are incorrect, causing the unit to stop working.. It appears on 1 Warmhaus model in our database.
Technical description: Low water pressure in heating system – parameter is adjusted wrong
What causes the Warmhaus rE02 fault?
This fault occurs when the boiler detects that there isn't enough water pressure to safely circulate heat around your home. The most common reason is a slow leak in the radiator system or air being released from the pipework, causing the pressure to drop below the minimum safety threshold.
This issue often appears in autumn when the heating is turned on for the first time after summer, as the change in temperature can highlight small leaks or trapped air.
DIY fix possible
Check the pressure gauge; it should ideally be between 1.0 and 1.5 bar.Locate the filling loop (usually a silver flexible hose) under the boiler.Open both valves slowly to allow water into the system until the gauge reaches 1.2 bar, then close them tightly.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Warmhaus models that show the rE02 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Warmhaus rE02 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 27 April 2026