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Yes, the pressure does go up when the system fires. Average rise is about 0.5 bar. There are no visible water drips from any part of the system.

Just read the Wiki, going by the definitions there I *think* this is an open vented system, but I could be wrong. It features a valve and tap by which you can add water to the system, a small vent pipe that goes through the wall at one side, and the boiler appears to have a kind of wide chimney...

Our central heating system loses pressure in a dramatic way (gauge is down to zero within 2 weeks of topping up the system). This has been going on for several months. We've looked at all the radiators and at the wall/floor around the boiler, and re-checked an underfloor pipe that was mended a...

OK, I think I see the problem. The red light is connected at one side only to reflect the state of the switch. I guess I need to swap all my connections over. Thanks for the help.

Thanks for the quick reply. Forgive my ignorance but I'm not sure I understand 'side terminals.' There are 2 large cables coming out of the wall, each consisting of a set of 1 live, 1 neutral & 1 earth wires. I assume from the diagram that one of these bunches is the supply and one the...

I've just wired up a new pull-cord switch for our shower (a 45A DP ceiling switch). This switch has both a red pilot light and a dial that reads 'On' or 'Off' as you pull the cord. I looked carefully at the existing wiring and the wiring diagram; there were basically 2 sets of red(L), black(N)...