What's causing this central heating problem?

[grahamdbrown]

Hello everyone.

Problem related to boiler/radiators

Symptoms:
* Radiator in top (3F) cold
* Radiator in 3F and 2F leaking water + orange fluid
* Boiler pressure at 40PSI/2.8Bar
* Leaking from overflow pump outside door

Setup
* Megaflow Heatrae Sadia tank
* Potterton Suprima 60L Boiler
* Grundfos Pump
* Installed new with house 5 years ago

Have already
* Drained radiators and refilled to remove air
* Bled radiators

But symptoms persist

Any ideas?

 

[Bahco]

Reduce pressure in boiler to 1 bar and read FAQS for rad problems.

 

[paulybaby]

top rad could be locksheild closed/trv prob.
is filling loop being left open? you only need 1-2 bar pressure in system. it will drip from prv approaching 3 bar. or could be expansion vessel fault/blockage.

 

[spacethegas]

orange fluid sounds like rust in the water. repair leaks or possibly renew affected rads if necessary.

 

[grahamdbrown]

Thanks guys
How do I reduce boiler pressure to 1Bar?

 

[paulybaby]

with hose on a system drain cock. turn off system. make sure filling loop is closed. [could be letting by]

 

[grahamdbrown]

Thanks Paulybaby...

Previously I turned off system and opened the PRV with lowest hot tap open in the house until water drained out then refilled tank. When I did this, the pressure came right back up to 40PSI when tank reloaded. However, I didn't turn off the filling loop when doing this.

Are you talking about something else?

Apologies for sounding dumb!

GB

 

[gas4you]

Sounds like you have been draining the Megaflo?

You need to drain the heating system slightly. A drain cock will probably be under a downstairs radiator, or built into the lockshield on one of these.

Sounds like you need a proper flush to remove the rust. Probably never installed correctly, like most new builds, house basher couldn't be bothered to add inhibitor most like

 

[grahamdbrown]

Sounds like you have been draining the Megaflo?

You're right there!

You need to drain the heating system slightly. A drain cock will probably be under a downstairs radiator, or built into the lockshield on one of these.

OK I have found the drain cock - assuming it's the run off under the radiator.

I'll attach a hose and jubilee clip to it and open up the cock.

* Do I need to open any radiators upstairs somewhere otherwise it seems water won't run out?
* Is there anything I should do to prevent newbie disaster?

[/quote]

 

[paulybaby]

open drain off slightly till you hear/feel water trickle. look at pressure gauge on boiler/system. pressure should fall. dont open any rad vents.relax. deep breaths.