What the manual says
Manufacturer manualPower up mode.
From this model's manual
Verified against the Worcester Bosch Greenstar Ri installation & service manual, page 37.
DIY fix possible
Wait 5 to 10 minutes to see if the boiler begins normal operation automaticallyIf the code persists, turn the boiler off at the fused spur switchWait 30 seconds and switch the boiler back on to initiate a fresh startup sequence
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