Boiler losing pressure after system flushed.

dakan

Hi Folks

recently had my central heating system flushed and cleaned and non-corrosive liquid put in. That all went fine but since the boiler has been losing pressure. I've checked for leaks on the rads and at the exhaust part of the boiler that goes outside.

The plumber thinks it may be air in the system. I'm having some trouble getting him to come back but in the meantime if it isn't a big job is there anything I can do to sort it? I have a radiator key and the system has a manual top-up.

Thanks.

Dublin City Handyman

Should be a easy fix, if you can find the valve on the feed to the system.

dakan

Do you mean the manual top-up? When the pressure is low I refill it there.

Dublin City Handyman

dakan wrote: »

Do you mean the manual top-up? When the pressure is low I refill it there.

Yes.. You will do a bit quicker if you have someone with you.. One to keep a eye on the gage and one to bleed the rads... Bleed all the rads not just the one that's not working.. Gage pressure reading should be about 1.5 bar.

dakan

Thanks for the help Dublin City Handyman, but I'm going to have to get the plumber back out. I'm topping it up everyday now and it isn't getting back up to the pressure level it was at before. Whatever they've done to it :mad:

Alun

Possibly there was a small leak somewhere that was blocked up by all the accumulated gunge in the system, and the flushing removed that.

dakan

That's what I'm thinking. Problem is I'm in an apartment so the people who will find out are the ones living below me.
If there is found to be a leak can someone with experience or knowledge of such things tell me what can be done or who is liable? I'm going to contact the management company and let them know I think I have a leak and it may effect downstairs. Other than waiting to see if the leak is found by creating a damp patch somewhere, I don't know what else to do.

Alun

How quickly does it lose pressure? We had a very slow loss of pressure in our system, but putting a leak sealant through the system helped enormously. I'd say if it was a major leak, someone would have said something by now, so you may be in luck.

dakan

It is losing pressure very slowly. Goes from 0.9 bars to 0.8 in about 2 hours. I'll suggest the leak sealant to the plumber and see what he says. Thanks for taking the time to respond.