BoilerFaultCodesFerroli E37 Fault Code
The Ferroli E37 fault code means: your boiler has stopped working because the amount of water inside your heating system has dropped below the minimum level required to run safely.. It appears on 2 Ferroli models in our database.
Technical description: Low system water pressure
DIY fix possible
Locate the filling loop (usually a silver braided hose with a valve) underneath the boiler.Open the valve slowly to allow mains cold water to enter the system until the pressure gauge on the front reads between 1.0 and 1.5 bar.Close the valve tightly to stop the flow and ensure the boiler resets itself.
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Gas Safe Register →Ferroli models that show the E37 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli E37 fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026