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Hi My silly question for today is, can I remove the fuse at the mains fusebox to the water heater and have the mains supply on so effectively isolating the heater so work can be done over the next week, without having to power down everything in the rest of the house?

Unscrewing the immersion heater is the part I'm not looking forward to. The family has had to improvise over past few days with no hot water. Thanks for perservering with me today John, your help along with others have made things clearer and conclusion has been reached. Have youself a good...

Thanks all. It is looking very likely that the element has gone. endecotp - what will it mean if there is resistence on higher ranges? I think I've already measured all terminals against earth; all returning 1__._ Burnerman - re. first finding, just so I understand, when you say it's...

I think I meant infinity

When the probes are touching against each other, I get a reading of 00.4 at 200 ohms. Whn not touching, I get 1 __._ (the _ being blank, so I'll assume infinity. With the stat bought this morning, I get a reading between 00.5 and 00.7 - does this mean it's potentially faulty? When set at 200...

Thanks for you advice endecotp (and others!) and being patient with me! Yes, I should have made clear that in all the tests I've made were under the main fusebox being completely OFF.

I'm sure I tried 200 ohms and probed the grey and blue terminals; if I recall, I did not get a reading. Nor did I get a reading between grey and brown. Having had the heater on for 30 minutes again, I think it is wamring up the water, but very very slowly. Would this suggest the element is...

Right, I've just done another check. Placing the probes on earth, grey, neutral (blue) and live (brown) does not provide any meaningful results. Most of which came back with 0.00. However, when placed on grey and blue and meter set to 2000mv, the reading fluctuates between 140 and 190 ish...

It's through the side, about a feet off the ground. The original stat length was 7 inches.

I feel compelled to take the day off work tomorrow to fix this problem:)

Whilst I'm waiting, does anyone know which valve I've need to use to drain the water from the cylinder? Red or green? I think the water inlet is from the green pipe, so I'd imagine the drainage would be the red valve?

The washing machine's on at the moment. Another 40 mins before I can power down the mains supply. At what settings do I test the resistence on the element (grey & blue?)? Sorry for all these newbie questions.

Hi John So I shall leave the power coming through the main fusebox ON, then switch ON the water heater, followed by placing the red and black probes as you've directed? This wouldn't fry me or short circuit anything, will it? I assume if there's a light on the heater switch, electricity is...

Thanks for everyone's input. I decided to pop out and pick up a replacement stat, now fitted. At least I now have one which has a reset switch and complies with current regulations! The old one had a rattle too; something is loose inside. After 30 - 60 mins, the water is still not hot, not...

Hi newboy By turning the power to the immersion, do you mean from the main fusebox or is the switch to the heater in the OFF position OK? Touching the probes when set at 200 ohms results in 00.4. When not touching, it shows 1 . . I can't see the 80 and 180 points you're referring to...

Morning I've used the following meter to test this morning (don't laugh please, I know it's old school!). I mainly used the sections V--- and V~, as the ohm section produces some weird readings. Placing the leads on the grey and blue terminals (elements), returns some results in the region of...

Cheers for your advice John - hopefully, it'll be the stat that's gone pop!

When I took the picture earlier, I did notice that it slides out quite easily (about an inch with the wires still connected). When I switched it on earlier, it sounded as if it was boiling, but after half an hour, the water remained cold. What exactly do you mean by 'continuity at any point of...

Thanks John I will have to give this a shot tomorrow when I get a chance to power down everything and perform the suggested tests. Will I have to get a qualified electrician to change the stat (if that turns out to be defective - I hope the fault lies here as cheaper option?), or can I do it...

Thanks John. Does it matter where I place the meter's black and red leads onto the grey / brown / blue terminals?