BoilerFaultCodesWhat the manual says
Manufacturer manualBoiler locked by external switching contact
Shared across the Greenstar 4000 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.
DIY fix possible
Check your smart thermostat or external timer settings to ensure no 'Away' or 'Holiday' mode is active.Verify that any external wiring control device is powered on and communicating correctly with the boiler.Try power cycling the boiler by turning it off at the fused spur for 60 seconds and turning it back on.
Find a Gas Safe engineer
Search the official register →
Boiler cover options
Avoid the next call-out bill
A cover plan would handle faults like 232: no call-out fees, no surprise bills.
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.
Related fault codes
All 105 fault codes on the Greenstar 4000 System
Seeing a different code? Every code this model can display, in one place.
200201202203204208214224227228233234235237238242245249250251252253254258259262263265268269273281283284305306353357358360362363810811101010131017101810191021102210231037106510681070107110721073107410751076208529082910291429152916292029232927292829312940294629482949295029512951 V29522952 V29572957 V29612961 V29622962 V29632963 B29642964 B29652965 B29662966 B29672967 B29702970 B29712971 B29722972 V