Circulations problems on a upland open vent system

[JAH HEATING]

Turning into a bit of a ballache...

had everywhere roasting, couple of hours latter downstairs living room rad goes cold an a bedroom one..

had hose on drain offs, throttled lock shields right down on upstairs, trvs off on rads an at times it gets hot, then stops...

it has x400 in system to, any suggestions ?

Constanly venting a couple of rads to remove air

 

[albatross]

upland??

constantly venting could be pipework issue, pump sucking in air?

 

[JAH HEATING]

No an yes mate.

 

[Ermintrude]

Not micro *****? Or plastic on walls is it? Pumping over due to blockage?

Altered pump speed?

 

[JAH HEATING]

Not micro *****? Or plastic on walls is it? Pumping over due to blockage?

Altered pump speed?

No mate, all 15 on 3 drops. 8 rads in total.

altered pump last night, late last need. Half nine to be precise.

it had a potterton suprima in, replaced it yesterday an had everything bouncing.

i drained down each leg, pretty cleanish to be honest.

filled up cold an let it run for a bit on each doff.

through some cleaner in, an got everywhere hot an was going to go back an flush it midweek.

 

[Ermintrude]

Did u cut out cold fill and vent when u changed?

 

[JAH HEATING]

Did u cut out cold fill and vent when u changed?

No.

th tank was spotless by the way.

i did ask her how her heating had been fine, fine apart from bleeding bathroom now an again she said.

 

[Ermintrude]

I did one recently

 

[Ermintrude]

I did one recently tank clean as some idiot drained down and rinsed all debris in to system

 

[Ch4 plumbing]

I'd go with partial block on the return pipe or just stubborn old fashioned air moving about.