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Hi looked at system in a bit more detail, found what I think is a pump, its red hot, it has "controller 's' " written on it, when it is hot water only it does not supply to the cylinder but when the heating is on it does ( the return pipe gets warm) so I guess there might be a problem with this...

how can I test that? +++++++++++++++++++++++++++++++++++++++ And is it easy to change????

Motor valve is that the cincron or what ever its called

The reason I want to know the above is because I only get hot water when the heating is on thats why I think it maybe the therm in the cylinder any help would be appreciated.

How do you test if a cylinder thermostat is working or not?

He lives a while away and has no computer, i'll try and answer by phoning what ever you ask. He says he has plenty of hot water in all taps?

Ok, Spoke to him and heres the story, shower is a pumped thermostatic (bar type) fed by hot water cylinder, he now says that you can have a hot shower in the day but not in the evening? Heating (boiler is on till about 10pm he tries to shower at about 8pm but its cold, tried it at 6pm and its...

any help would be greatful

My mate has no hot water from his therm-mixer shower? Cold showers every day.