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Okay, used CH for the first time last night with no problems, come to switch it on today and there's a screaming noise coming from the boiler unit. No noise with just HW, but wails like a banshee with CH activated. I assumed that it's the pump sticking and disassembled, removing front disc...

This happened to mine a while back. Turn CH and HW to off. Remove the cente cover on the pump and stick a bowl under it (only a small amount of water will come out), put a screwdriver into the slot that you have just uncovered and try turning it. If it spins then your pump is knackered...

I think I'd be tempted (probably stupidly) to put a thin layer of plaster over the offending stain, rub it back and then paint over it

Thanks gents, really appreciate your help.

Yes, very similar. Was told system is gravity fed, as there is no pump to push water around, only that tank, and a separate pump for the radiators. Sorry if I've called it the wrong thing :(

Loft = empty. Is it possible that it's fed direct from the mains?

Though I hate to sound like an idiot, I'll ask this for the sake of my downstairs neighbour.. "What's the header tank and how do I get to the ballvalve?" From what I can see, I've got one big insulated tank that holds the hot water, is that what you mean?

Hi, hope you can help with this.. I've got a gravity fed hot water and central heating system that's making weird noises (ooer). At the mo. the central heating is turned off and only the hot water left on. When I turn on the hot tap (not always but often) a vibrating/banging noise...

Santorium be a an old nickname from school. No second 'a' required :wink:

Kev: screw in middle that opens to show pump spindle etc. Haven't taken one apart before, so don't know what to expect and just being careful. Mrcrow and breezer: many thanks for the explanation on why it's called a gravity system that now makes sense. Namsag: It's hardly my fault that I'm...

Thanks for the advice gents. One last question - do I need to disconnect the electricity supply before I go unscrewing the pump?

Gave pump a good smack with hammer, but zero joy :( Am assuming it's time to take it to pieces and look for gunge clogging it up? It's definately not vibrating, but it was warm to the touch - should it be like this? Also it has a twisty dial on the bottom with numbers 1,2,3 - I'm guessing...

Will check on pump tonight and advise tomorrow, appreciate the help so far. Yes, I read science which is why I still don't understand it being a gravity system. As the heat would rise, surely the only way for a hot water tank above the boiler to become heated is via convection, unless you're...

Thanks for the info. The pump (honeywell from memory) is definately not running is there an override switch to check whether it's broken or just not being told to run? Question: How does the hot water from the boiler climb up to the hot tank?? Would have thought that gravity fed would have...

System is configured so that to get CH you must have HW on. All fine with HW, but no joy with radiators. They just went cold in the middle of the day. Wall mounted thermostat makes expected click when twisted, so I'm assuming all fine there. Control unit lights up as expected and boiler def...

I have the same problem. Solution was a de-humidifier :)