Immersion tank help please

[ImFree2doasiwant]

Anyone around who could offer advice?

Yes, I advise you to explain what the problem is.

I have oil Central heating. Its programmed to come on for an hour to heat the water each evening, separate to the heating. The pipes and tank are warm, the control thing is on as usual, but the water coming out of the taps is cold.

I had someone looking at the bathroom sink taps yesterday, he says he didn't switch anything off as couldn't find a way to turn off the hot water. I can't understand how it is not connected.

His long has this been happening?

What colour is your hot-water cylinder?

How old is your shower mixer?

Can you post some photos of the cylinder and the pipes and other objects around it, especially the ones with wires and cables.

What does "looking at" mean?

Its green, pale green. Joule make i think. 3 yrs old. Replaced with new boiler. No shower.

Looking at - was going to refurbish tap as stuff old and drippy, but couldn't get the tap off.

Happened yesterday so I can't see its a coincidence!

OK, green means it is vented (low pressure)

a commom cause is a mixer tap, with high pressure cold supply, has an internal leak allowing cold water to push into the cold taps. Most often this is a shower mixer but can be a bath or basin mixer (UK-design kitchen sink mixers are designed to prevent this happening to prevent pollution of your drinking water). It is most common in "ceramic" mixer taps, especially those with a sngle lever joystick. Do you have anything like that?

It will cause water to overflow from the cold-water tank in your loft, which will (should, must) have an overflow pipe running outside the building and dripping where you will be able to see it.

There are other possible causes, but some photos will give more clues.

To test the pressure on your cold-water taps, put your thumb on the spout of a hot-water tap and turn it on. You should be able to block the flow. Now turn it off, and try the same on cold. Can you block it?

This advice is only relevant to people who have a low-pressure hot-water cylinder.

"an internal leak allowing cold water to push into the cold taps. "

I meant

"an internal leak allowing cold water to push into the hot pipes.

There is a mixer tap on the bath with the lever and shower head. There is definitely a problem with this - if I turn the hot water tap its a very poor flow out of the shower head, and if I try to mix hot and cold, the cold does overpower the hot.

Would this cause the hot tap on the bathroom and kitchen sinks to run cold though?

I can stop the flow of water from the hot tap with my thumb. I didnt try the cold, its clear that I couldn't and would just get soaked.

it might be that mixer.

if you can take the bath panel off, feel the pipes under the taps. If they have not been used for a couple of hours they should both be at room temperature. Run the cold tap and feel its pipe go cold. The other pipe should be unchanged. Run the hot tap and feel its pipe go hot. After ten minutes the cold one should still be cold and the hot one should still be warm. After half an hour they should both be approaching room temperature.

try the same on any other mixer taps.

if that's not it, please post the photos tound the cylinder. Look at your boiler and see how often it fires up (with heating set to off, and HW set to on).

@PigletJohn thank you, for all of your advice and suggestions. It turned out (as originally expected) to be something that someone had turned off.

grrrrrrr!

I know. What a bloody nuisance! It was the cold water feed to the tank that was off. I dont understand WHY that resulted in cold water coming out of the hot tap, but it did. As soon as it was turned back on, warm water started coming out