324 High

ECA 324 Fault Code

The ECA 324 fault code means: your boiler's electronic control system is confused because it is receiving conflicting or identical signals from two different sensors, causing it to shut down for safety.. It appears on 1 ECA model 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: BX input, same sensor
Typical repair cost £150-250 (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 324 fault code

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

Source

ECA 324 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