345 Low

ECA 345 Fault Code

The ECA 345 fault code means: your boiler is reporting a connection issue with an optional solar-powered swimming pool heating add-on that does not appear to be installed or is not communicating correctly.. It appears on 1 ECA model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Solar enj. control element swimming pool K18 missing

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 345 fault code

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

Source

ECA 345 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