combi boiler, pressure continuously increasing.

Juman islam · Apr 17, 2019

Hi,

I have a vaillant ecotec plus 837 and one day noticed the pressure was maxed out therefore bled the radiators to drop it down to 1.2~1.4 bar.

Two weeks later, I noticed my pressure increased back up 2.5 bar so had to bleed the radiators again.

A guy at work told me the increase in pressure is probably is due a failure in my filling loop. What are other peoples views on why this is happening?

Thanks in advance.

Aire · Apr 17, 2019

If it's continually increasing even when the heating isn't been used then yes you may have a faulty filling loop/link. There are other possible causes for this too though so maybe best that you get a registered engineer in to check the system over.

Rob Foster · Apr 17, 2019

Turn off the filling loop at both ends and remove it carefully. If it leaks from the valve..s then call a plumber to replace the naughty valve. If the pressure still rises with the filling loop detached your problem is MUCH bigger and call a GSR combi specialist. Centralheatking

JohnnyM · Apr 17, 2019

As above with the filling loop but could be the **deleted as mentioning internal component** Call a Gas Safe Engineer.

Coby kenny AGUILAR · Apr 17, 2019

I think that model the filling loop is practically internal, built into controls (keeping it vague).

If you have no wet work experience call an engineer

Juman islam · Apr 17, 2019

Thanks lads. Got home to check the pressure and it was at 2.3 so increased again within a space of 2 weeks from 1.2.

I've attached a picture of my where my filling loop is. Mate at work said to get the boiler serviced abit earlier than usual and get them to replace the filling loop at the same time. Is the filling loop replacement an easy DIY or best to leave to the pros? Im quite good when it comes to DIY and mechanics but never worked in boilers before.

Riley · Apr 17, 2019

No pic

Juman islam · Apr 17, 2019

Sorry! Pic attached now.

Rob Foster · Apr 17, 2019

Juman islam said:
Thanks lads. Got home to check the pressure and it was at 2.3 so increased again within a space of 2 weeks from 1.2.

I've attached a picture of my where my filling loop is. Mate at work said to get the boiler serviced abit earlier than usual and get them to replace the filling loop at the same time. Is the filling loop replacement an easy DIY or best to leave to the pros? Im quite good when it comes to DIY and mechanics but never worked in boilers before.

It will not be the filling loop it might be the isolation valves, or something much more internal which requires a GSR fitter. Those
iso valves look rather tasty and expensive to replace. So take one end of the loop off with them turned off see if water still flows before replacing. centralheatking

Aire · Apr 17, 2019

Remove the hose marked in red and see if the valve is passing any water. If it is then remove the valve head marked in blue and see if you can nip the valve a little tighter with a spanner.

Aire · Apr 17, 2019

Rob Foster said:
It will not be the filling loop it might be the isolation valves, or something much more internal which requires a GSR fitter

How can you say it won't be the filling loop when that's the first thing any engineer would check?

Rob Foster · Apr 17, 2019

Craig Watson said:
How can you say it won't be the filling loop when that's the first thing any engineer would check?

the filling loop is just a connection, its the valves that might be passing chking

Juman islam · Apr 17, 2019

Craig Watson said:
Remove the hose marked in red and see if the valve is passing any water. If it is then remove the valve head marked in blue and see if you can nip the valve a little tighter with a spanner.

View attachment 38188

So after removing the hose marked in red, if there is not water leaking past the valve, does that mean the braided loop only needs changing?

Rob Foster · Apr 17, 2019

Juman islam said:
So after removing the hose marked in red, if there is not water leaking past the valve, does that mean the braided loop only needs changing?

no the braided hose is just a connection its the integrity of the valves you are testing
chking

Aire · Apr 17, 2019

Rob Foster said:
the filling loop is just a connection, its the valves that might be passing chking

My apologies, I see what your saying, when I refer to the filling loop I mean it as the hose and valves combined.

Juman islam · Apr 17, 2019

Craig Watson said:
My apologies, I see what your saying, when I refer to the filling loop I mean it as the hose and valves combined.

I was thinking of getting the filling loop and valves changed first and was told to get a replacement, I need my GC number which is 47-044-33. Does anyone know where I can pick one up?

Aire · Apr 17, 2019

Juman islam said:
So after removing the hose marked in red, if there is not water leaking past the valve, does that mean the braided loop only needs changing?

After removing the hose, if there is no water, then the fault won't be with the cold inlet valve to the boiler, in that case you will need an engineer in to check the boiler over.
If it is passing water then it may just be the plastic head not shutting off fully, so by removing the plastic head and using a spanner on the brass nut, you may be able to close it off a little further.

Aire · Apr 17, 2019

If it is passing and your happy changing the valve then this is what you'll need
Heating Spare Parts

Juman islam · Apr 17, 2019

Craig Watson said:
If it is passing and your happy changing the valve then this is what you'll need
Heating Spare Parts

And by changing this, is it advised to change the loop itself or is that fine to re-use?

Rob Foster · Apr 17, 2019

Juman islam said:
And by changing this, is it advised to change the loop itself or is that fine to re-use?

you obviously really want a new filling loop regardless that you dont need one. centralheatking

Aire · Apr 17, 2019

The hose itself should be fine but if you want to replace it all then you'll need this
Heating Spare Parts
And this
Heating Spare Parts

Rob Foster · Apr 17, 2019

let us know how you get on
centralheatking

Aire · Apr 17, 2019

Check The valve first though, no need replacing parts that are fine just because someone has advised you do it.

Rob Foster · Apr 17, 2019

Craig Watson said:
Check The valve first though, no need replacing parts that are fine just because someone has advised you do it.

especially 'someone at work'

Chuck · Apr 17, 2019

Juman islam said:
Mate at work said to get the boiler serviced abit earlier than usual

Good advice.

Juman islam said:
get them to replace the filling loop at the same time.

Bad advice. The root cause is unlikely to be the 'filling loop' because that would require both valves to be passing, which is improbable. It can be eliminated as a possibility by disconnecting the flexible hose, which is how the system should be normally left in any case.

Juman islam said:
Im quite good when it comes to DIY and mechanics but never worked in boilers before.

And if you've got any sense you won't start now. Anyone who wants to 'work on boilers' needs to get properly assessed, qualified and onto the Gas Safe Register, go on the manufacturers' training course(s), then buy the several thousand pounds worth of gear needed to do the job properly and safely.

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combi boiler, pressure continuously increasing.

Juman islam

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Coby kenny AGUILAR

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