CH Pump Change & No Hot Water

[cts1975]

I fitted a new pump to our central heating yesterday.
I drained the system and fitted as per the pump instructions and all seemed to go back to normal.
We have an unvented pressurised hot water tank which was fitted 3 years ago due to low water pressure.
It is a "Centerstore Indirect Unvented Hot Water Cylinder"

Since the new pump has been fitted we have water flow from the hot taps at the usual pressure but its cold.
Any help appreciated - if you need more system info let me know.

Edited by cts1975 on Sunday 22 January 15:09

[cts1975]

Yes it has an electric emersion.
http://www.plumbcenter.co.uk/product/centerstore-i...

The Primary Flow is warm and the Primary Return is cold - is that normal?

I've purged it again this afternoon. I turned the mains water off and the hot taps on, they ran dry after may be 1 or 2 minutes.

[cts1975]

I've no way of knowing if the immersion is powered up. There are no lights etc on the tank. I have it switched on via the switch next to the tank. That's all I can tell you I'm afraid.

[cts1975]

finlo said:

Have you bled the coil in the cylinder?

No - not sure how to I'm afraid.
Just wondering if the 3 position valve is suspect.
The pipe coming of towards the tank is cold?
The other to 2 pipes being hot.....

[cts1975]

21TonyK said:

Is the pipe coming straight out the top hot? This is your hot outlet.

Just checked - it's stone cold.

finlo said:

There should be means of bleeding the circs where they enter/exit the cylinder.

Just a valve/tap on a pipe going to the separate expansion chamber, thats all I can see.

[cts1975]

Busterbulldog said:

Deffo airlock

How can I solve that?

[cts1975]

Jonesy23 said:

Asking the obvious question - after replacing the pump did you remember to reopen the isolation valves?

Yes I remembered.
Can anybody explain the 3 way valve. I'm not convinced that's working correctly. The closest warm/hot pipe to the tank is before the valve, should the hot water not be passing the valve on its way to the tank?

[cts1975]

[cts1975]

[cts1975]

The bleed screw sticking up below these 2 arrows???

[cts1975]

Yep just done that. No air or water seemed to be released. Would that be correct?
Thanks

[cts1975]

Not that I'm aware of? How would i do that?

[cts1975]

Potterton Suprima. It's not a combi.

[cts1975]

[cts1975]

dirkgently said:

whoever installed the cylinder hasn't appeared to have installed an energy cut-out.

Hi. Can you elaborate on this? It's sounds safety critical!

[cts1975]

So big thanks to all those who commented and made suggestions.
It seems that I had spilt water on the 3 way valve whilst removing the pump. It had water inside the casing!
A plumber fitted a new 3 way valve and after starting the boiler and then bleeding the system all is back to normal.