BoilerFaultCodesECA F81 Fault Code
The ECA F81 fault code means: your boiler has paused itself because the internal temperature sensors are giving conflicting readings and cannot accurately tell how hot the water is.. It appears on 4 ECA models in our database.
Technical description: Temperature Sensor Deviation Test Delay (blocking) — temperature sensors may be defective; notify ECA authorised service
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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ECA models that show the F81 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
ECA F81 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