Logic 24 - hot water only turns on radiators

[Oonagh]

When I turn on water only on the logic 24 boiler the water heats up and so does the radiators. It’s a a single floor apartment with the boiler recently serviced and the safety valve and 12 litre vessel change.
Using the hive heating system.

 

[cjg]

sounds like the diverter valve gone, get a gas reg engineer in to check.

 

[king of pipes]

Most likely cause is the diverter valve passing you need a engineer I'm afraid