I have a Potterton HE30 combi boiler in a three bedroomed flat. Pressure was always fairly low - between 1 and 0.5 bar - but since I turned on the heating this autumn, it has sunk to zero.
As it is a smallish flat, most radiators are still heating up, and hot water is OK, but I guess it will just get worse.
Where can I find the filling loop?
Is it a (relatively) simply job to top up the pressure?

Julian Duplain, October 2007

Further to my question, I've now repressurised the boiler - once I found the right tap under the boiler, it took a matter of seconds.
But I have two more questions for any CORGI experts:

1. As it seems so easy to do, once you find the right tap to turn, why does the manufacturer tell you to call an installer if the pressure falls below 0.5 bar?
I would guess that most people with a combi boiler suffer a loss of pressure at some point - why not make it easy for the owner to repressurise, since it does only seem to take seconds?

2. So far as I could see there was no filling loop - the two inlets where I guessed the loop should go were sealed with blanking plugs.
Would I have been able to repressurise without the filling loop in place?
If so, was it dangerous to do so?
Or perhaps the loop was there in a different place from the one I expected.

Thanks for any help you can offer.

Julian Duplain, October 2007