Cold water tank in the attic overflowing

[GGg]

No joy. Turned them off one by one. And then turned off the isolation valve on the entire feed on the pump. Still trickling.

 

[Riley]

Let it drop back down to below the overflow

 

[GGg]

I noticed on the hot water pipes on the pump where freezing cold. Like a mains water pipe. Not sure if this is a stupid point to make, but I turned off the mains water and the water going into the tank has now stopped. If the coil was split wouldn’t it drain down the F&E?

 

[Riley]

How many pipes come off the two larger tanks you have a cold feed to the cylinder. Anything else?

 

[GGg]

How many pipes come off the two larger tanks you have a cold feed to the cylinder. Anything else?

Cold feed to cylinder on the one tank. The other tank has a cold feed to the pump for the bath (both hot and cold tank fed)

 

[GGg]

Turned mains water back and and immediately started going back up into the tank. I can’t access shower mixer to isolate but assumed isolating the entire feed off the hot water pump would do it.

 

[Riley]

So it literally feeds the pump?

 

[Riley]

Sorry I’m getting mixed messages with this does the pump do hot and cold water for the whole house or just for one shower. If all the house is pumped then the fault can only be with your kitchen mixer

 

[GGg]

Sorry I’m getting mixed messages with this does the pump do hot and cold water for the whole house or just for one shower

Pump does whole house, hence I thought if I used the isolation valves on the pump it would stop any backfilling mains. But either the isolation valves aren’t turning off fully or im barking up the wrong tree. However I can feel the pipes on the pump they are cold as if mains water is flowing through.

 

[Riley]

Kitchen mixer won’t be pumped

 

[GGg]

Kitchen mixer won’t be pumped

Kitchen mixer is pumped, turns pump on etc.

 

[Riley]

Only on hot, the cold should be straight from the mains

 

[GGg]

Only on hot, the cold should be straight from the mains

Yes. 3 taps and shower are all like that.

 

[GGg]

Only the bath is tank fed hot and cold.

 

[Riley]

Right let’s backtrack as we keep going round in circles here. Any outlet you have that is hot pumped and cold mains could be your culprit and from what you said sounds the only logical explanation