BoilerFaultCodesSime P 02 Fault Code
Also written as P02 — same fault.
The Sime P 02 fault code means: your boiler has detected that the water pressure inside the system is too high, which prevents it from operating safely.. It appears on 1 Sime model in our database.
Technical description: High pressure
DIY fix possible
Locate a radiator in your home that is easily accessible.Place a cloth or small container under the radiator bleed valve.Open the bleed valve slightly to release air and a small amount of water until the boiler's pressure gauge drops back into the green zone (typically 1.0 to 1.5 bar).Close the valve tightly once the pressure is normal.
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Sime models that show the P 02 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Sime P 02 fault code information on this page is sourced and cross-checked against the official Sime service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026