I have a Glow Worm Boiler 65/80. There is a single heater unit for the dual purpose of CH and domestic water supply, although the hot water for bathroom and kitchen is provided by pumped circulation. There is a Cylinder (23 Gallons). A corrosion inhibitor was added recently to the CH installation. I normally have HW even if the CH is off.
A month ago I noticed there was not hot water, but the CH was OK.
A heating and plumbing engineer came and said the pump needed replacement.
He also installed an emergency electrical heating element to the hot water cylinder. So I had hot water heated by the electrical emergency system as soon as it was installed.
On completing the work the engineer checked that the boiler fired up when we set the CH thermostat at a higher temperature than that of the house. After his departure I noticed all downstairs radiators were hot but not the upstairs. The engineer did not check whether the Central heating hot water system was working, as the cylinder was full of electrically heated hot water. He said it was no way to check the actuator valve. Now that I switched off the electrical emergency hot water, I see that the hot water cylinder and pipes around it are cold: and I am again as when I called the engineer: without hot water.
Please could any one advice me on this matter? I am afraid the engineer has not found the root of this problem. Do you think I should ask him to change the actuator valve? It is anyway to check if it is working? Do you think the problem could be the timer? I have a Drayton dual channel programmer, installed 4 or 5 years ago. It is any way to check this also?
Any advice would be very welcome.