Potterton profile, ch works ok. hw works but rads get hot also.

[armyash]

Going to this job tomorrow.

The central heating works ok, goes on on and off when it should.

The boiler fires ok when there is a demand for HW but then the rads get hot too.

Apparently it's had a brand new three port put in last week but the fault still continues.

Programmer?

What else could it be?

 

[Atouchofgas]

Full three port or just the head? If just the head, replace body

 

[Rickster123]

Check that they've actually changed the 3 port and not just the head.

 

[bigads28]

Make sure it's wired properly too!!

 

[plumben]

I'd look at the 3 port too first, its not uncommon for new parts to be faulty aswell

 

[gassafe]

Reverse circulation maybe if its pipework fault

 

[Billy Bob Bob]

apart from what everyone else has said,have you asked if its a new fault or existing? can only be as already mentioned if recent but if existing last T rule has not been followed

 

[stevetheplumber]

pound to a penny the last bloke only changed the head

 

[armyash]

I thought the guy only changed the head but he swears he changed the whole thing otherwise that's what i would have done first. I think he's going back today with a new programmer.

 

[Millsy 82]

If you have 240v on white as well as orange with only HW on then double check the wiring. If you don't have 240v on white and it is still passing through the 3 port then he has probably only changed the head.

I have had a few cheap valves pass from brand new as well so it may be down to that.

If it is not circulating through the 3 port then it will probably be piped up wrong, if it is only just showing up after years the chances are someone has fitted a nrv and it's stuck open.