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Thanks everyone. Appreciate all your help and expertise. The cylinder is magnetic, therefore steel, as you stated. The 'corrosion' however, appears to me to be primarily a build-up of deposits on the outside, as opposed to rust. I can chip it off with my fingernail. I can't see where the...

Thanks. Appreciate the feedback. It has been playing on my mind what I 'signed' on his phone. He just said to keep the system all switched off in case it exploded, and when I said I wasn't sure I could do that, he said well, you'll have to sign something to say I advised you to. I didn't think...

Thanks. Why do you think it needs replacing? There is the corrosion-like area and probably a very slow leak but the brown material is on the outer surface. Looks like the grey paint is bubbling a little - (top-left of the brown part) - does that mean the whole cylinder would need to go?

The brown stuff clearly looks like it's caused by leakage, but it's been like that for years and it's dry to the touch.

Hi - wonder if someone can give me an opinion. I am undecided whether I should pay thousands for a repair, or whether I'm just being scammed. In short - I have a solar-powered hot water system (hot solar fluid gets piped through the inside of an unvented water cylinder). When the water from the...

Thankfully my system seems to be working normally again. I think the stuck valve theory is a good one - seems to have got unstuck again! Thanks to everyone who took the trouble to help. I'll post back if problems resurface but for now, it's all OK. Great forum.

Yes. I have a meter and know a reasonable amount about electrics. Not too sure of working with mains voltages, but I know the principles. Do you have an idea? Sorry - I need to go out now, but will check back on here later/in the morning for any updates.

Thanks. Just found another box (see edit to my last post). Looks electrical to me - no pipes.

Many thanks once again. I don't see a second one. I've photographed the whole of the system (see below). The last two images show the tank and the solar panel system, which I don't think are relevant to the central heating system. There is a small box on the piping from the tank (centre of...

I don't hear anything from the valve when I switch it on or off, except water flowing/stopping flowing. I think I can hear sound coming from the pump. Not sure where I would see the lever - there is a sort of grey slider button on the bottom (you can see it in the photo, through the loop of...

Thanks very much - sorry for being so vague! I have taken some photos which might help... Thermostat: Honeywell DT90E Controller: Horstmann ChannelPlus H37XL Series 2 Valve: Myson Power Extra We had not adjusted anything - the fault just occurred on its own. [/img]

Many thanks. That sounds logical. Is there a way I can test this? Do you know where it sits? I am guessing next to the red tank near the heating controls? EDIT: Got it! A Myson Power Extra - little white box. Silly question perhaps - should I knock it with a hammer to see if it frees up the...

Thanks. There's a switch marked "Heating" next to the Hortsman controller. I switched that off and the cupboard where is is went quiet. (There's a small red tank in there, loads of piping, a water tank which I presume is nothing to do with the central heating, and yet another controller with all...

Streuth! The temperature is still going up. Just put batteries back in the thermostat and it's 27.5 in the room. Is this dangerous? How can I disable the whole system?

Thanks. The water was off, but I've made sure it is by switching the controller to permanently off. It's ridiculously complicated. We have solar panels, heating up the tap water, and if the water in the tank isn't hot enough, then the boiler will add some more heat. The Central Heating...

Hi. I know very little about central heating systems. My problem is the radiators are all stuck on full blast. I am using a Honeywell thermostat, I think it's a DT90E. The thermostat is set to 20. It shows room temp at the moment to be 26.5. There is no 'flame' symbol on the display, so...

Thanks. Is that the only solution? The building firm who put the house up are telling me to check the pressure gauge on the boiler and seem to think this is a case of me not knowing how to work the system. Is it possible it's something which I could fix if I knew what to do?

Hi. Hoping someone can help - just moving into a new house and the thermostat seems to have packed up - I'm not sure. It is a Honeywell and I think it is the DT90E. On the digital display, where the temperature normally shows, it just says FAil. None of the buttons respond when...