F50 High

ECA F50 Fault Code

The ECA F50 fault code means: your boiler has lost communication with the temperature sensor in your hot water storage tank, meaning it cannot monitor or heat your water correctly.. It appears on 3 ECA models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Storage Tank Sensor Fault (blocking) — storage tank sensor may be defective; press Reset; if persists notify ECA authorised service
Typical repair cost £90-160 (including labour)

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 F50 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

ECA F50 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 31 August 2026