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OK, so can i change the cycle rate to do less 1 minuet cycles per hour, how is this done? The manual does not explain how to change this parameter. Thanks for your advice :)

My boiler is a Viessmann 26Kw open vented system The main controller is a Honeywell ST9400c with a Honeywell CM907 programmable thermostat. Its running with the CH on continuous and the programmable thermostat is controlling the CH. It all works fine until it reaches temperature. Then it seems...

Thanks very much for your reply. What i have found is that the position of the Honeywell Prog thermostat (In the Hallway) nr a radiator (which i have even turned off) and yet still hunts between being on and then off in the space of a minuet or so. This means the boiler,pump and valves are...

Thanks very much, so the CH valve should be closed every time the thermostat clicks OFF and the CH valve should be driven open when the thermostat demands heat. Are my honeywell motorizied valves rated for lots of on and offs. I thought the CH valve would stay open while the CH is ON, and the...

Can any one help? I have just had fitted a new boiler with a programmable thermostat. I am not convinced that it has been wired correctly. When the thermostat reaches temperature it turns OFF the CH valve and goes via the pump overrun pipe work. Surely the boiler should just turn off its gas...