What boiler is it Gerry?
Have you got a GC number for it at all?
If your boiler is on a sealed system (no small header tank in loft) then you will probably need to top the system's pressure back up. This is usually done via a filling loop under the boiler on the pipework and can be identified usually by a chrome braided hose. On either end of this hose should be a tap which you have to turn a quarter each to put more water into your system. There should also be a pressure gauge either on the pipework but more commonly on the boiler itself with a neele that moves. Turn both taps till the pressure is between 1 and 1.5 then turn them both back on. Reset your boiler and away it should go. Alternatively your boiler may have a built in filling loop and you will find there may be either a couple of taps on the underside of the boiler that you can turn or a couple of baller-fix valves which require a flat bladed screwdriver to turn them. Again, both a quarter turn. Hopefully this will solve your issue, but its very hard to tell without a bit more info on what you have. As you may also have an issue with sludge if your system is producing air, it may b that your low water pressure sensor is blocked or stuck closed or that your flow switch is stuck etc. Unfortunately remote diagnostics are hard with boilers. But let us know how you get on.
Martin, February 2012
