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only when it was installed earier this year. at that time only the day immersion heater was working so I wonder if having both immersion heaters connected is causing the trip as the night immersion may be working as well even though it is only meant to come on at night.

yes.

the 40amp is the night immersion heater and the 16amp, labelled 1 storage heating in green is the day immersion heater. the electrician labelled it wrong. they don't trip, only the main RCD trips.

i mean there are cables to the wall switches in the pvc trunking.

yes the two switches are next to each other on the wall. the feed to the two switches on the wall are run inside a pvc trunking here is an old photo of it

yes, you could only test the night time one at night as there is no power to it. the day time one (24 hour) trips at any time it is switched on as the power to it is constant. power supply to the flat between 11.30pm and 6.30am is on the lower rate cost as far as i understand. before dynorod...

the day time one is also live at night. it doesn't switch off. the night time one comes live between 11.30pm and 6.30 am

yes, the system is economy 7. but both are tripping.

no, the dynorod guy only fitted the immersion heaters as I have a policy with them and so that covers only the immersion heaters and no fixed wiring, which was why I had to employ a separate electrician to test the wiring when the newly installed immersion heaters tripped.

If NICEIC registered as approved contractor and domestic installer can't be relied upon then not sure how else you are supposed to verify a company's competence. I would expect they can still be incompetent, but I would hope NICEIC do checks on electricians before approving them!

then i don't know. i know there are two switches on the consumer unit for the immersion heaters, which i assume are what you guys refer to as MCB and the main switch on the consumer unit, which I understand is called the main RCD. i don't know if the MCB are RCBOs. the consumer unit was...

but i would expect they wouldn't get NICEIC accredited though?

i don't know what RCBOs are.

i suppose he could be unfamiliar with immersion heaters and do not know how they should be connected? i looked at a youtube video on how to wire them and there were 3 connectors, live neutral and earth, so i can't see how that can go wrong? i didn't see a video of the thermostat being...

the electrician did not say the immersion heaters were incorrectly connected. he said there was a loose wire, which he tightened but that was not the cause of the tripping. i think he would have known if the connection was not done correctly and have reconnected it.

why do you need G3 for unvented? is it more complicated to be unvented?

the companyis NIC-EIC accredited, so i assume he is qualified enough to be competent.

i think it is vented. i don't have a current pic but this is an old pic yes vented and unvented. the vented ones get the water from a cold water tank and the unvented ones get water directly from the mains. i don't think the difference would have any signifance on my problem though?

it just seems odd that both immersion heaters would be faulty. as they are wired individually, they can be tested individually and they are both tripping the RCD when they are switched on individually. the dynorod plumber says they are brand new as i suspected he may have used second hand ones...

as mentioned above because there was no hot water from the tank and so dynorod said the immersion heaters were broke. at that time, there was no tripping of the RCD, there was just no hot water. dynorod replaced the two immersion heaters and could not turn them on as the RCD tripped. so I got...