Medium
Noisy operation on Worcester Bosch Greenstar Utility

Your boiler is making loud or unusual noises, which usually suggests there is trapped air in the system or a mechanical part is starting to wear out.

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

Pump noise from air in pump or worn pump; Worn motor bearings; Fan out of balance

From this model's manual
Verified against the Worcester Bosch/Worcester Bosch Greenstar Camray Utility 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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All 18 fault codes on the Greenstar Utility

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

32/5032/50kW50/7050/70kWBoilingBURNER FAILS TO STARTBurner motor fails to operateFlame detection faultHIGH SMOKE NUMBERIgnition failureIncorrect CO2Intermittent lockoutLOCKOUTNo oil from nozzleOIL SMELLSPulsation on startShort Cycling

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