Immersion heating help required

[marco86]

A write looking for a bit of help for a Job I have been given and not too clued up on immersion heating.

woman has no hot water, she has aHE7 water heater boost control switch in her kitchen. I bought a replacement controller but this one has 10 connections and the one I have have has 5. There are two supplies coming to the switch, one from off peak board and other from consumers main board.

am now lost

 

[telectrix]

photos essential here.also make/model of old/new/

 

[brucyboy]

There are different types of e7 timers. I think you need a e7bx or a bx2000 10 wire are for duel supplies ie economy 7 heating. Hope this helps
http://www.horstmann.co.uk/water-heating.php

 

[Guitarist]

Maybe ask the person who gave you the job to explain what is required.

 

[brucyboy]

I'd also check the thermostat in the immersion tank. Has the circuit been tripping out could be a faulty heating element. There will be two a top element for boost and the bottom for off peak. All can be check with continuity tester with both supply's safely isolated.

 

[onions1066]

Or could just be the thermal cut out if one is fitted and if it hasn't I Would recommend fitting one for what they cost

 

[i=p/u]

rubbling in the attic...

 

[marco86]

Thanks for the responses and the lack of info I have provided.

We bit more info.
i put the boost on and there is power going through the thermostat and element.

at the eco7 there are 3 twins and earths, one off peak, one on peak and other going to the tank.


currently in the house at the moment is a HE7 economy boost control and am looking to out in a time guard TRTM7

 

[marco86]

Ok after taking my weekend head off I have worked out what has to be done.
Either get a like for like swap a e7bx unit or fit a standard Eco 7 unit and do away with the off peak feed going to the unit.
Anyone got a e7bx unit for sale??