Boiler pressure

Questions about central heating and boiler questions in here please.

Moderator: Moderators

Post Reply
Rover7895
Newly registered Member
Posts: 5
Joined: Sat Mar 23, 2019 5:53 am
Has thanked: 3 times
Been thanked: 0

Boiler pressure

Post by Rover7895 » Sun Mar 24, 2019 12:57 am

Hi people.

I've just moved in to a rental and the boiler pressure is too high (2.5 bar normal and 3.5 when heating on).

I've tried to bleed the radiators but hasn't really helped matters.

I got in touch with the letting agency and they just said the landlord assures them that the boiler passed the safety checks.

I'm a total novice and I don't know what I'm doing here but I don't dare put the heating on.

Any help would be appreciated.
Attachments
20190323_042911-1008x756.jpg
20190323_042911-1008x756.jpg (108.17 KiB) Viewed 644 times
20190323_042858-756x1008.jpg
20190323_042858-756x1008.jpg (51.42 KiB) Viewed 644 times
20190323_042853-756x1008.jpg
20190323_042853-756x1008.jpg (97.81 KiB) Viewed 644 times
User avatar
someone-else
Senior Member
Posts: 8877
Joined: Sat Sep 01, 2012 6:03 pm
Has thanked: 32 times
Been thanked: 1498 times

Re: Boiler pressure

Post by someone-else » Sun Mar 24, 2019 9:35 am

The pressure gauge shows the system pressure, so as you have said you should bleed the radiators, but you actually let water out not just air. Have a mug and cloth to hand. But do keep an eye on the pressure gauge, you don't want it to drop too much.
These users thanked the author someone-else for the post:
Rover7895
Rating: 7.14%
Fret not, a forum is a collection of opinions. Above, are mine.

Which is correct? Metre or Meter? Click the link to find out more.

Working on anything electrical? have you got a multi meter? why not? Would you hit a nail with a shoe?

If gloom had a voice, it would be me. :mrgreen:

:idea1: How to post a picture on this forum Click here
User avatar
ayjay
Senior Member
Posts: 8415
Joined: Wed Nov 17, 2010 5:51 pm
Has thanked: 409 times
Been thanked: 1432 times

Re: Boiler pressure

Post by ayjay » Sun Mar 24, 2019 10:02 am

someone-else wrote:so as you have said you should bleed the radiators, but you actually let water out not just air.
......boiler/pump, turned off whilst bleeding.
These users thanked the author ayjay for the post:
Rover7895
Rating: 7.14%
One day it will all be firewood.
Rover7895
Newly registered Member
Posts: 5
Joined: Sat Mar 23, 2019 5:53 am
Has thanked: 3 times
Been thanked: 0

Re: Boiler pressure

Post by Rover7895 » Sun Mar 24, 2019 10:12 pm

ayjay wrote:
someone-else wrote:so as you have said you should bleed the radiators, but you actually let water out not just air.
......boiler/pump, turned off whilst bleeding.
Which one is the pump?
PLB
Senior Member
Posts: 508
Joined: Thu Jul 14, 2011 11:37 am
Location: Coventry
Has thanked: 85 times
Been thanked: 81 times

Re: Boiler pressure

Post by PLB » Sun Mar 24, 2019 11:20 pm

In your case if you turn the boiler off (Function Switch Set To 0) the pump will not run as it’s inside the boiler.

Set to 1.5 bar when cold.

The following is from the manual.

12.7 When the system is bled of any air it must be refilled until the pressure shown on the display gauge indicates a system pressure of 1.5 bar.

12.8 If the pressure shown on the gauge exceeds 1.5 bar discharge the excess pressure from the system via a radiator valve or pipe connection. Do not use the safety discharge valve as the valve seat may become contaminated with debris and fail to re-seal.
These users thanked the author PLB for the post:
Rover7895
Rating: 7.14%
Rover7895
Newly registered Member
Posts: 5
Joined: Sat Mar 23, 2019 5:53 am
Has thanked: 3 times
Been thanked: 0

Re: Boiler pressure

Post by Rover7895 » Mon Mar 25, 2019 1:00 pm

Ok I've bled each radiator and the pressure hasn't gone down. Still sat on 2.5 bar.
User avatar
someone-else
Senior Member
Posts: 8877
Joined: Sat Sep 01, 2012 6:03 pm
Has thanked: 32 times
Been thanked: 1498 times

Re: Boiler pressure

Post by someone-else » Mon Mar 25, 2019 6:25 pm

Rover7895 wrote:Ok I've bled each radiator and the pressure hasn't gone down. Still sat on 2.5 bar.
someone-else wrote:bleed the radiators, but you actually let water out not just air.
Fret not, a forum is a collection of opinions. Above, are mine.

Which is correct? Metre or Meter? Click the link to find out more.

Working on anything electrical? have you got a multi meter? why not? Would you hit a nail with a shoe?

If gloom had a voice, it would be me. :mrgreen:

:idea1: How to post a picture on this forum Click here
PLB
Senior Member
Posts: 508
Joined: Thu Jul 14, 2011 11:37 am
Location: Coventry
Has thanked: 85 times
Been thanked: 81 times

Re: Boiler pressure

Post by PLB » Mon Mar 25, 2019 6:38 pm

Temporarily turn off the mains cold water feed valve underneath the boiler.
The one with the blue handle just to the right of the yellow valve.
Bleed a radiator, does the pressure now drop?
Report back to us.
User avatar
someone-else
Senior Member
Posts: 8877
Joined: Sat Sep 01, 2012 6:03 pm
Has thanked: 32 times
Been thanked: 1498 times

Re: Boiler pressure

Post by someone-else » Mon Mar 25, 2019 6:47 pm

If you are thinking what I think you are thinking, would it not be better to remove the filling loop?
Also, would it not be a case of if you are right, would the pressure always be increasing?

I can not help but wonder has the OP let any water out? (other than the odd drip)
Fret not, a forum is a collection of opinions. Above, are mine.

Which is correct? Metre or Meter? Click the link to find out more.

Working on anything electrical? have you got a multi meter? why not? Would you hit a nail with a shoe?

If gloom had a voice, it would be me. :mrgreen:

:idea1: How to post a picture on this forum Click here
PLB
Senior Member
Posts: 508
Joined: Thu Jul 14, 2011 11:37 am
Location: Coventry
Has thanked: 85 times
Been thanked: 81 times

Re: Boiler pressure

Post by PLB » Mon Mar 25, 2019 7:07 pm

Sorry,
I should have explained.
I believe that a situation like this could be caused by a pinholed heat exchanger?
So therefore yes, filling loop valves passing was my next thought. :thumbright:
Re pressure increasing. It would increase and settle at whatever the property supplied mains water pressure happens to be. So that could be 2.5 bar in the op case.
Rover7895
Newly registered Member
Posts: 5
Joined: Sat Mar 23, 2019 5:53 am
Has thanked: 3 times
Been thanked: 0

Re: Boiler pressure

Post by Rover7895 » Mon Mar 25, 2019 9:16 pm

someone-else wrote:
Rover7895 wrote:Ok I've bled each radiator and the pressure hasn't gone down. Still sat on 2.5 bar.
someone-else wrote:bleed the radiators, but you actually let water out not just air.
7 radiators and filled half a bucket before I gave up as the pressure wasn't going down.
User avatar
someone-else
Senior Member
Posts: 8877
Joined: Sat Sep 01, 2012 6:03 pm
Has thanked: 32 times
Been thanked: 1498 times

Re: Boiler pressure

Post by someone-else » Mon Mar 25, 2019 10:33 pm

Try it again, but turn the house water supply off first.
Fret not, a forum is a collection of opinions. Above, are mine.

Which is correct? Metre or Meter? Click the link to find out more.

Working on anything electrical? have you got a multi meter? why not? Would you hit a nail with a shoe?

If gloom had a voice, it would be me. :mrgreen:

:idea1: How to post a picture on this forum Click here
Post Reply

Return to “Central Heating & Boilers”