BoilerFaultCodesSime 62 Fault Code
The Sime 62 fault code means: your boiler is struggling to detect that it has enough water inside to operate, often because the filling valve has been left open or the internal pressure is dropping.. It appears on 4 Sime models in our database.
Technical description: D.H.W. filling
DIY fix possible
Check that the external filling loop or internal filling valve is fully closed.Check your boiler's pressure gauge and ensure it is between 1.0 and 1.5 bar.If the pressure is low, use the filling loop to top it up to 1.5 bar, then ensure the valve is tightly shut.
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Sime models that show the 62 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Sime 62 fault code information on this page is sourced and cross-checked against the official Sime service / installation manuals for each affected model.
- Sime Dewy 30/130 HE FS manual (PDF)
- Sime Dewy 30/50 HE WM manual (PDF)
- Sime Planet Dewy BFR manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026