Pressure Loss On A Viesman Boiler

[jetdfa]

Help! We have been having a problem with our Viesman combo boiler for months. The pressure keeps dropping!

We had a plumber round on friday and had all of the floor board by all the rads up and had a lad crawling round the tiny gap under the house but all rads are bone dry.

There is no sign of a leak com in from upstairs and we are topping it up all the time - over a bar in 3 days.

We are going to try the leak seal next but running out of ideas beyond selling the house.

Anybody got any brainwaves????

 

[Phill Peck]

Any drips from the copper pipe outside?
How old is the boiler?
Do you have it serviced?
Where is it installed? Eg loft ground floor etc

 

[jetdfa]

Hi, thanks for response.

The copper overflow Blowoff pipe is actually in the garage. The plumber has unscrewed it so I can see if anteater is coming out the system and there is none so far.

The boiler and whole system was installed in December 2008 so just over 4 years old. It has been ok for years but we have always had a bit of an issue with the last towel rail on the system not being warm due to inadequate pressure.

The plumber has given it a good once over and fully balanced the system about a month ago and we thought that had cracked it but same issues started again soon after.

It is installed in the laundry which is on the ground floor.

Thanks

 

[ashleybradley82]

There may be a problem with the boiler itself, rather than a leak. The pressure gauge may be faulty, or something else inside. Is it still under guarantee?

 

[JohnD]

that is very improbable.

If you keep putting water in, it must be leaking out somewhere.

You can't see the leak

so it is probably somewhere you can't see, probably a pipe under the floor.

 

[jetdfa]

We have looked under all of the floors on the ground floor that are timber and checked all the pipe leading into the rads. We have 2 areas of concrete floor with underfloor heating but as the leaks seem to be so fast when the pressure is above 1 bar surely it could not be soaking into the concrete that fast?

The only hope I have is to try a leak sealant. Failing that we will have to lift all the floors upstairs. I would have thought we would have seen evidence of a leak by now though given the volume of water.

It is driving me mad not knowing where the water is going!!!

 

[Agile]

There are several possibilities for leaks on the boiler itself.

A competent boiler engineer should know how to check that. I dont know about plumbers though.

Tony

 

[jetdfa]

Tony,

Thanks, I will look into a boiler engineer. Don't suppose you know any in the Nottingham area?

I recall you giving me advise on my last boiler back in 2011 on this forum too so thanks again!

Joe

 

[Agile]

There are several in Notinghamshire who post on this forum.

You could try to see if they have contact details or may be able to send them a PM.

Water leaking in concrete can run away and produce no evidence on the surface.

Sometimes thermal imaging can help to pinpoint leaks in concrete and possibly a simple IR thermostat. But the boiler needs to be confirmed as not the problem first.

Tony

 

[jetdfa]

Thanks, I have found one and have them booked in for next week. After that I am getting the wrecking ball out on the house!!!!!