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RBW9 cannot get Central Heating without heating Water?

I can switch my controller to have Central Heating with Domestic Hot Water.
I can switch on Domestic Hot Water on its own.
I cannot switch Central Heating on its own without Domestic Hot Water. Please help.
Ray Madden, October 2009
it may be that the type of system you have cannot have c/h only, it is quite common and it's down to the way the system is designed.

Ian, October 2009
If it is a old system ie hot water gravity, pumped heating, you can not have heating only.
Clock is switching the boiler on then when you want heating it the puts power to the pump.

erj, October 2009