High
9 25 blinking on Saunier Duval Ecosy 24E

Your boiler has stopped working because it cannot move the hot water around your system effectively, so it has shut down to protect itself.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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.

What the manual says

Manufacturer manual

If the fault (E 25) persists after 5 attempted relights, the boiler shuts down and requires a manual reset. Check that the pump is operating, the central heating isolating cocks are open and that there is circulation in the system.

From this model's manual
Verified against the Saunier Duval/Saunier Duval Ecosy 24e 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 is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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All 40 fault codes on the Ecosy 24E

Seeing a different code? Every code this model can display, in one place.

00.1 21 81 9022 52 82 902.03.05.06.07.0808.11.13.14.15.16.17.2424.26.3030.3131.3232.3636.3737.40.41.42.44.60.

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