What the manual says
Manufacturer manualHeat demand lower than energy supplied
From this model's manual
Verified against the Worcester Bosch/Worcester Bosch Greenstar 4000 installation & service manual, page 73.
DIY fix possible
Check that at least two or three radiator valves (TRVs) are fully openEnsure the central heating system is not restricted by closed bypass valvesWait for the boiler to automatically restart once the temperature dropsPerform a simple reset if the code persists
Find a Gas Safe engineer
Search the official register →
Boiler cover options
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
Approved partner
Get a quote →
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Affiliate links. We may earn a commission at no extra cost to you.
All 105 fault codes on the Greenstar 4000
Seeing a different code? Every code this model can display, in one place.
200201202203204208214224227228232233234235237238242245249250251252253254258259262263268269273281283284305306353357358360362363810811101010131017101810191021102210231037106510681070107110721073107410751076208529082910291429152916292029232927292829312940294629482949295029512951 V29522952 V29572957 V29612961 V29622962 V29632963 B29642964 B29652965 B29662966 B29672967 B29702970 B29712971 B29722972 V