Medium
CE on Alpha E-Tec Plus 28

Your boiler is receiving an unusual temperature reading from an external sensor, preventing it from heating your home correctly.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

External control connection only used with system supervisor connection (occurs when external sensor reading offset is over +9)

From this model's manual
Verified against the Alpha E Tec Plus 28 installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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