Electrical/Plumbing?

[bedazzled]

I hope someone can help as I'm not sure where to post this topic. I have currently had an "unvented" pressurised water cylinder fitted. (Santon : 2x 3kw, 170 Litres. This cylinder has replaced our old gravity fed tank working on Economy 7 switch, which was installed with our night storage heaters. All was working fine, until now......The plumber (who is my brother) says he had connected the new cylinder to the economy seven switch in exactly the same way as the old tank had been connected but, when our new tank was installed and all ready for go, the switch tripped the electrics. It doesn't trip when the hot water is in the "off" position but, as soon as I switch over to "timed hot water" bang! trips out again . I've bought another control switch exactly the same as I suspected the digital board inside may have been damaged in the existing one..its not that, same thing happens...A fused switch added , same again.....Both thermostats have been tested with terminal blocks, electric does not trip!!?. There's a 20 Amp fuse in the consumer unit so it cant be that. Who invented the word BAFFLED It's got me.....Even the electrician let me down and never showed. Hope someone can help. Im burning my fuse box to help me sleep!!!!

 

[securespark]

What's tripping? The RCD or the fuse/mcb?

 

[bedazzled]

Cheers for the reply mate. It's tripping the "Immersion Heater" in the RCD.

 

[securespark]

Sorry. I'm confused now.

Is it tripping the breaker for that circuit (if so has the breaker got a button marked T) or is it tripping the wider RCD that switches off all circuits connected to it?

 

[bedazzled]

No I'm sorry . It's tripping the wider RCD. Forgive me for being slightly brain dead .

 

[bedazzled]

I have now wired the main thermosat straight to the RCD. Neither that nor the MCB has tripped? Boost thermostat has also been tested this way, same result, no trips, but, I just had a thought....should my hot water timer/control have more than a 13 amp fuse?

 

[ryanj]

Straight to the RCD? Not through any circuit breaker?

 

[bedazzled]

Yes, theres fuses for ALL the electrics in the house: ie..sockets dowstairs, upstairs ect. Its wired to the "Immersion Heater's" 20 AMP fuse

 

[il78]

Sounds like the element has gone to me.......

 

[bedazzled]

Sounds like the element has gone to me.......

Now I feel I have some of you baffled ...Sorry, but I have hot water with it wired this way. That would seem that the element is ok?
Tell me to call an electrician I know I know, hate it when things get the better of me, even If I do call another one out in the end.