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Andrew Smith
Andrew Smith, Engineer
Category: UK Plumbing
Satisfied Customers: 3629
Experience:  Domestic Gas, Commercial Gas, LPG, Unvented Hot Water, Part P Electrical, Commercial Catering
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I have two Worcester Danesmoor boilers supporting my hot water (pressurised cylinder) and

Customer Question

I have two Worcester Danesmoor boilers supporting my hot water (pressurised cylinder) and heating system. The boilers are heating the water even though the time is off. I understand this may be a micro switch problem. Where are they located and how will I recognise one>
Submitted: 2 years ago.
Category: UK Plumbing
Expert:  Andrew Smith replied 2 years ago.
Hi my name is ***** ***** lets see if we can get you sorted in the shortest possible time.
Can you follow the pipework to the cylinder.
There will be two pipe that enter the side of the cylinder.
One half way up will have a motorised valve on it.
Tell me if the lever is slack or tight?
Customer: replied 2 years ago.

Is the motorised valve a Dayton Zone Activator. If so, there are two. On one of them the short black lever is tight; one the other it is loose (bear with me as I have no internet signal where the boiler is located).

Expert:  Andrew Smith replied 2 years ago.
With everything off, the levers should be tight.
The one with the slack lever is stuck open and is keeping your boiler running.
Try removing the head and seeing if you can free the pin underneath.
Customer: replied 2 years ago.

If I can free the pin, what will happen?

Customer: replied 2 years ago.

Why no answer to my question about freeing the pin?

Expert:  Andrew Smith replied 2 years ago.
If you can free the pin and it can turn loosely then the head will work again as it powers open but should spring shut.

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