Heating stuck on and won't turn off - how to fix?

[Cordless]

And, just for the record, what was the problem and is it fixed?

 

[Dannyparty92]

On the picture why are there two pipes connected on the flow pipe just before the circulating pump?

 

[tamz]

From the bottom up on the flow:
Flow from boiler
Feed
Expansion
Bypass

Feed and expansion wrong way around and bypass in wrong position.
3 tees wrong out of 3. Fitted by a halfwit.

 

[SimonG]

From the bottom up on the flow:
Flow from boiler
Feed
Expansion
Bypass

Feed and expansion wrong way around and bypass in wrong position.
3 tees wrong out of 3. Fitted by a halfwit.

That's an injustice, sure it's a full wit

 

[Dotty]

Nah Simon, Tom was being generous. That boy would be hard pushed to make it as a halfwit! Probably the same cretin that throws pipes in New build houses over here.

I say throw cos what he's done definitely ain't plumbing!

 

[Dannyparty92]

Thank you for your replys . Why didnt he use an air separator? LOL the way the feed and vent is in relation to the pump wouldnt this cause the pump to be sucking air into the system?