Hot water Will not Come on

[solavie]

I have a back boiler with a hot water cylinder and two tanks in the loft. Recently the Hot Water will not come on as programmed or if I use the advance button, even thought the light comes on on the programmer. However, if I switch off the Central Heating (using the advance button) and switch on the hot water I can hear the motorised valve turn on and I the water get hot, even if I turn the Central Heating back on. If I also programme the hot water to come on before the Central Heating - then I get hot water.

I have replaced the cylinder thermostat and the Motorised valve (with I good one I has as spare which was working when removed). Will appreciated advice on what could be wrong. Thanks

 

[T & H Plumbing]

Ring a engineer

 

[Matt06]

Programmer relays might be playing up ( new programmer )

 

[solavie]

Rang a Boiler fitter I regularly use in North Wales and he suggested the 3 port motorised valve which I have replaced. Before that I thought of the programmer first and then the motorised valve. Will change the programmer sometime next week. (it was replaced 2 years ago - EIS - did not last long).

Is that fault something that is common?

 

[solavie]

Have replace the programmer and water and heating are working fine. It was definitely the programmer which was causing the problem. Thanks for everyone's input