What the manual says
Manufacturer manualReset button pressed by mistake (pressed for more than 30 seconds)
From this model's manual
Verified against the Worcester Bosch/Worcester Bosch Greenstar 25cdi installation & service manual.
DIY fix possible
Switch the boiler off at the fused spur or mains power supplyWait for 60 seconds to ensure the electronic memory clearsSwitch the power back on and allow the boiler to perform a normal restart cycle
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Related fault codes
All 13 fault codes on the Greenstar 27CDi
Seeing a different code? Every code this model can display, in one place.