What the manual says
Manufacturer manualBoiler stand-by
From this model's manual
Verified against the Vokera Excel installation & service manual, page 6.
DIY fix possible
Check your room thermostat to ensure it is set higher than the current room temperature.Check your timer or programmer to see if a heating or hot water schedule is currently active.Turn on a hot water tap to see if the boiler successfully fires up to provide hot water.
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