I have a sime format 80c boiler installed about 1 year ago.

The pressure on the boiler goes low, for no apparent reason.
We've had somebody from the waterboard come out to check our pressure, which is fine.

We've had a plumber out & he does not know what is wrong with the boiler. After the plumber drained the boiler, it was working again..... but only for 2 or 3 days.

Will draining and or flushing the boiler make it work again? Can I do this job myself?

There is a tap below the boiler, with which you can add pressure to the system & sometimes this has helped. This tap is now working sometimes, but sometimes not & the plumber who visited said that it needed fixing, but that it perhaps isn't worth fixing it, as it'll cost £60 and we shouldn't need to use it more than once every six months or so.

Hope somebody can help.

Scott, November 2007

If the boiler is losing pressure this implies there is a leak somewhere in the system. It could be from within the boiler itself but is more likely to be from a radiator. Check all the radiators valves for signs of water leakage from where the pipe joins the valve and also from the bleed screws. Failing this there could be a leak in one of the pipe runs somewhere which really should be traced before any damage occurs to your property.

Davie, February 2008