BoilerFaultCodesECA 164 Fault Code
The ECA 164 fault code means: your boiler has detected that the water pressure or flow within your heating system is too low to operate safely.. It appears on 1 ECA model in our database.
Technical description: Flow � pressure switch, heating circuit error
DIY fix possible
Check the pressure gauge on the front of the boiler; it should be between 1.0 and 1.5 bar.If the pressure is too low, use the filling loop valves under the boiler to top up the water.Ensure all radiator valves are fully open and there are no visible leaks in your pipework.
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ECA models that show the 164 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
ECA 164 fault code information on this page is sourced and cross-checked against the official ECA service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026