What the manual says
Manufacturer manualPower On
From this model's manual
Verified against the Potterton Performa 28i installation & service manual, page 6.
DIY fix possible
Wait a few minutes to see if the boiler transitions to normal operationIf the boiler remains stuck on this code, turn the power off at the fused spurWait 30 seconds and turn the power back on to perform a manual reset
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