What the manual says
Manufacturer manualBoiler in standby mode
From this model's manual
Verified against the Potterton/Potterton Powermax He installation & service manual.
DIY fix possible
Check your thermostat or programmer to see if it is set to turn on the heating or hot water.Ensure the boiler is switched on at the main power supply.If the boiler responds normally when you request heating, no further action is needed.
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Related fault codes
All 37 fault codes on the Powermax HE 85 Litre
Seeing a different code? Every code this model can display, in one place.