BoilerFaultCodesECA 85 Fault Code
The ECA 85 fault code means: your boiler has lost its wireless connection with the thermostat or remote control unit, meaning they can no longer talk to each other to manage your heating.. It appears on 1 ECA model in our database.
Technical description: BSB RF communication error
DIY fix possible
Check if the batteries in your room thermostat or remote controller need replacing.Ensure the wireless receiver near the boiler is not obstructed by large metal objects.Try moving the thermostat closer to the boiler to see if the signal reconnects.Reset the boiler and the wireless hub at the same time.
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ECA models that show the 85 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
ECA 85 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