#1

Just changed an old hot water cylinder and immersion heat the immersion heater is a heat merchants immersion it is pre wired so just got cable connecters and connected the 4 wires like for like black to black, brown to brown earth to earth and neutral to neutral but when i switched it on thr immersion did not work i checked for power at connector and i have power and correct polarty any ideas whats the prob

JohnnieK Registered User
#2

Did you check for power at the elements inside the cover?

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danjo Registered User
#3

As Johnnie says you should check for voltage at the terminals inside the cap.

However, for safety, I would not use cable connectors. I would connect the element cable directly into the switch.

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mazthespark Registered User
#4

check is thermal overload tripped by any chance may have to be pushed when you first install them or old wiring method miight be still used last ne i did think they were switching neutrals

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Micky Dolenz Registered User
#5

The old way of doing it was taking brown through stat and neutral to sink. You will have to investigate at switch and rewire there if necessary.

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meercat Registered User
#6

new immersion colours
brown -bath
black -sink
blue -neutral
earth -earth

old immersion colours
brown -neutral
black -bath
blue -sink
earth -earth

you will have to redo connection(preferably at switch)
remember to turn power off when undertaking work

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#7

The wiring to the switch is correct (colours) brown to bath, black to sink ect. When i switch the immersion on regaurdless whether it is on to sink or bath i am getting 230V at both brown (bath) and black (sink) terminals at the same time inside the cap when i presume i should only be getting one or the other? So maybe the actual switch on the wall is faulty because 230V is going to both terminals at the same time, i also got voltage on the inlet side of the thermostat and notting on the outlet. IM VERY CONFUSED (im thinking faulty switch) any help please

Micky Dolenz Registered User
#8

Have you tried turning the stat up and then testing? Does stat have a reset button?

The stat is in a dry pocket and will pull out, return to shop and they should replace it, it's about €8 to replace.

#9

Yes it has a over heat stat with reset but that is ok and i have continuity at over heat stat, but what i was thinking is the switch on the wall faulty because wheather i have selected sink or bath i am getting 230V on both brown (bath), black (sink) terminals at the same time at immersion, surely it must be at one or the other whatever one i selected?

danjo Registered User
#10

Open the switch and check the neutral connection also double check the neutral connections at your cable connector. Make sure you have not trapped the insulation there.
From recollection, with a dual immersion the neutral connection on both elements is a common pillar so if you have no neutral connected to this then a voltage will appear on both phase pillars It will appear as 220v as there is no current drawn and therefore no voltage drop.
As I said in my previous post it would be much better to connect directly to the switch.

#11

When you say negative thats the neutral connection your talking about? Sorry im a plumber not a spark

danjo Registered User
#12

Correct.
Sorry, I am from the era of positive and negative.
Nowdays they are only used in DC and phase and neutral are the proper terms, so you are correct.
p.s. I am not a sparks either .

gsr dog Registered User
#13

hi gsr dog here switch markings you should see l1 that should be 220 l2 should show 0 in off position switch on should show 220 in l2 ifs that shows 220 you have a missing netureal

johneym Registered User
#14

sorry to hijack thread. I am doing the same. I am replacing an old emersion from a dual coil cylinder with a new emersion to a new single coil cylinder. The wiring is the old version as stated below..
old immersion colours
brown -neutral
black -bath
blue -sink
earth -earth
Now that it will be a single coil,which wire do I omit, if any?

Thanks

Micky Dolenz Registered User
#15

Since you only have one live, pick one. So either make brown or black live. Just cut off the other cable and don't connect.

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