Also when you switch the programmer to CH or HW demand, does the boiler make any noise? Signs of the fan running or a clicking noise? If nothing then problem lies, as Ben says, with the pump or MV/s.
Have I missed the post stating the system is fully pumped. Lots of Profiles on Gravity Hot Water / 'C' Plans. What is ticking in the airing cupboard - piccie please?
Mr. W.
Have a look through FAQ, explanations with piccies and allReally sorry but what do these motorized valves look like? Dont have a gas cooker or fire.
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