BoilerFaultCodesECA F49 Fault Code
The ECA F49 fault code means: your boiler is having trouble communicating with your room thermostat, which means it isn't receiving instructions on when to turn the heating on or off.. It appears on 3 ECA models in our database.
Technical description: Modulation Room Thermostat Communication Fault (blocking) — room thermostat may have failed or connection problem; switch off and on boiler; press Reset; if persists notify ECA authorised service
DIY fix possible
Locate the main power switch for your boiler and turn it off for 30 seconds, then turn it back on.Press the 'Reset' button on the boiler control panel.If you have a wireless thermostat, check and replace the batteries to ensure it has enough power to send a signal.
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ECA models that show the F49 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
ECA F49 fault code information on this page is sourced and cross-checked against the official ECA service / installation manuals for each affected model.
- ECA Confeo Premix HCH manual (PDF)
- ECA Confeo Premix HM manual (PDF)
- ECA Confeo Premix HST manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026