High
POINT E on Worcester Bosch Highflow 300

A small cooling fan inside the boiler's control panel has stopped working, which prevents the system from starting to ensure the electronics do not overheat.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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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

Internal fan (inside control box) does not run

Shared across the range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

What causes this fault?

This fault occurs when a small dedicated cooling fan located inside the boiler's main control box fails to spin up. Over time, the fan motor can burn out or become clogged with dust, preventing it from cooling the sensitive electronic components. As a safety precaution, the boiler will refuse to ignite to prevent the circuit board from suffering permanent heat damage.

This fault is more common during the summer months or during periods of heavy use, as higher ambient temperatures make it harder for the control box to stay cool without a functioning fan.

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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Related fault codes

POINT CView →POINT DView →

All 57 fault codes on the Highflow 300

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

6A6C6d9UA1A4A5A7A8ACAdB1b2b3b4b5b6b7C1C4C6D1d3d5d6E2E5E9EAF0F1F7FAFdH1H4H7H9HCHeatbank Overheat StatHot water high limit statNo codeoverheat lock-out statePOINT BPOINT CPOINT DPOINT FPOINT GPOINT HPOINT IPOINT JPOINT KPOINT NS9Safety limit statSy

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