Medium
2945 on Worcester Bosch 2000 GC2000iW 25 C NG

Your boiler is rapidly cycling on and off because it cannot efficiently release the heat it is generating, which often points to a blockage or a bottleneck in your heating system.

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

Too many short heat demands in short time period

From this model's manual
Verified against the Worcester Bosch/Worcester Bosch 2000 Gc2000iw 2019 installation & service manual, page 86.
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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Related fault codes

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All 144 fault codes on the 2000 GC2000iW 25 C NG

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

2002012022032042072082122142152242272282292322332342352372382422442452462472492502512522532542562572582592622632642652682692702732752813053063233283413423503513563573583603623633643656048108151013101410171018102110221023106510681073107410751076205120852908290929102911291229132914291529162917291829202921292229232924292529262927292829302931293229402941294229432946294729482949295029512952295329542955295629572958295929602961296229632964296529662967296829692971297229732974b1C1C4C6Constant redd1d3E2Flashing red

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