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Hi again, could this be the problem "blockage in the hot water circuit. Switched heating off but kept water on. Increased the pump power to MAX and that blew through the obstruction and it's all working fine now". got the above from someone's problem thread.

so does that mean a new stat is required or some control needs to be changed?

Hello, I need urgent help from someone. Installed a vaillant ecotec 418 boiler about two months ago. heating works fine but boiler does not heat the water. I had a new valve installed but still nothing changed. I have 7 years Vaillant warrenty but vaillant thinks the issue is not...

Please see the attached picture. white valve replaced a week ago and silver is an old. I hope this is helpful.

boiler pic

The installer has replaced the valve he thought could be the problem, I guess we can replace the other one as well. I will try to get a photo for you to see.

Hi, well the engineer installed the drayton valve, i see two valve there and both heat up and the valve is not T shape but the other one. thanks

Hello, I need urgent help from someone. Installed a vaillant ecotec 418 boiler about two months ago. heating works fine but boiler does not heat the water. I had a new valve installed but still nothing changed. I have 7 years Vaillant warrenty but vaillant thinks the issue is not...