What the manual says
Manufacturer manualPower On
From this model's manual
Verified against the Main Eco installation & service manual, page 7.
DIY fix possible
Wait a few minutes for the boiler to complete its internal startup sequence.If the boiler remains on this code for more than 10 minutes, turn the power off at the fused spur.Wait 30 seconds and turn the power back on to see if it clears to a normal operating temperature display.
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