Discuss Scratching my head here with this. in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

hammers4spanner

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HAve hot water cylinder that have changed the immersion. However have changed it over still not working. Have 240v going through the element and all seems correct but still no hot water
 
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townfanjon

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Proved 240 v not just a red light .. have you 240 coming out of the stat
 

Last Plumber

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You need to test L & N. Or test L to E and then N to E.
Sounds like a broken Neutral.
 
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hammers4spanner

hammers4spanner

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It all started from power cut so a dodgy neutral could happen from that ?
 

Best

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Did you check the immersion spur switch? Could be loose neutral wire there or can be inside the switch.
Remember the switch (2 pole) will have 2 switches actually inside and one of them can be faulty.
Also check at consumer unit or another switch that might be elsewhere.
Use a multi meter
 

ShaunCorbs

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Easy way to tell at the stat

Live to neutral 240
Live to earth 240

Then test the element
 
B

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Did you check the immersion spur switch? Could be loose neutral wire there or can be inside the switch.
Remember the switch (2 pole) will have 2 switches actually inside and one of them can be faulty.
Also check at consumer unit or another switch that might be elsewhere.
Use a multi meter
Would that still give him 240v to immersion?
 
B

Burger

HAve hot water cylinder that have changed the immersion. However have changed it over still not working. Have 240v going through the element and all seems correct but still no hot water
Might be a stupid question but, you have left it long enough to heat up? And turned the immersion stat up?
 
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hammers4spanner

hammers4spanner

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Easy way to tell at the stat

Live to neutral 240
Live to earth 240

Then test the element

Done that and tested the element 19.3

Left it for 30 mins and was stone cold .

Must be something deeper caused by power cut
 

ShaunCorbs

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townfanjon

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Any reason? I thought this proved if the element was good or not?
I used to subby for Kingspan , in my experience they work or they dont , I have put them in with ridiculously low or high readings and they still work.
If anything if they didnt read right they tended to be noisy , poor insulation I think .
Golden rule with any immersion heater as the ultimate test , wire it up to a plug and put it in a socket, if it works you look towards stat, programmer , spur switch etc etc.
 
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bypass the stat wire it direct and see if it heats up a bit then
centralheatking dont leave it on too long or unattended
centralheatking
 

quality

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if the immersion is 19 odd ohm then thats around 12 ish KW which means it ok. I would be looking at the integrity if the wiring. The golden rule with electrical work is knowing what your doing
 
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hammers4spanner

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I used to subby for Kingspan , in my experience they work or they dont , I have put them in with ridiculously low or high readings and they still work.
If anything if they didnt read right they tended to be noisy , poor insulation I think .
Golden rule with any immersion heater as the ultimate test , wire it up to a plug and put it in a socket, if it works you look towards stat, programmer , spur switch etc etc.
Good idea that
 

Millsy 82

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What I would do is 240 L-N and 240 L-E if that's good then turn power of check for continuity across thermostat (or overheat stat as sometimes seperate)

If all of those are ok then faulty immersion.

My guess is the stat as they are shocking.
 
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if the immersion is 19 odd ohm then thats around 12 ish KW which means it ok. I would be looking at the integrity if the wiring. The golden rule with electrical work is knowing what your doing
240V/19ohm = 12amp, not 12kW. Power = 240^2/19 = 3kW, about right for an immersion.
 
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