432 Low

ECA 432 Fault Code

The ECA 432 fault code means: your boiler's external outdoor temperature sensor is either disconnected or faulty, meaning the system doesn't know how cold it is outside to adjust its heat settings.. 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: Soil function is not connected
Typical repair cost £120-200 (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 432 fault code

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

Source

ECA 432 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