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Danger : EDDI heating too much hot water and filling the cold tank the attic with hot water too?

JimmyVik

So my friend gave me a call about his attic being all steamy and like a sauna.

I called up and we had a look in his attic. The plastic cold water tank up there is full of boiling water. So much so i wouldnt be surprised if the tank is compromised.

What is happening is that the EDDI is heating his water in the main immersion tank and the valve is releasing the water that gets too hot back into his tank upstairs. The EDDI is diverting so much heat that its a near constant gushing out of boiling water into the attic tank.

Does anyone know what can be done about this or is it a matter of switching his eddi off?

You can see the eddi switching from one element in the tank to the other as the temp is reached, but both are at top temperature now.

Im worried his tank is going to soften and burst, the water in it now is that hot. Not to mention condensation all over his attic.

In the winter for sure this water will be streaming down the walls of the attic.

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Ubbquittious

https://www.boards.ie/discussion/comment/119140229#Comment_119140229

You can take the thermostat out and replace them. There is often a second safety thermostat under the cap that has the 2 elements + thermostat. but not always

JimmyVik

Thanks guys. Going to give it a go and try to fix it for him. Its one of those elements that has the thermostat inside the tank too. So im thinking it probably needs a new element or can you just take the thermostat out and replace it.

graememk

https://www.boards.ie/discussion/comment/119140160#Comment_119140160

Yeah thermostat on the immersion is prob dead, it's not a difficult fix though.

Can be bought at any hardware store.

Surprised the over temp in the immersion didn't click out before it boiled jnto the cold tank

You don't need to turn off the solar, switching off the eddi will be fine

JimmyVik

He checked himself there no and its set at 60. But you could hear the water boiling in the tank so it was well over 60 so something not right there.

JimmyVik

Thanks, I'll try that so. Any idea how the isolation switch for the solar is marked?

dmigsy

There an off switch on the eddi. I'm no electrician but I'd turn off the isolation switch on the solar as well as the mains.

JimmyVik

https://www.boards.ie/discussion/comment/119139861#Comment_119139861

Thanks. I'll call down to him tomorrow and see if i can adjust the thermostat on his cyllinder. Good thing he spotted it before something terrible happened.

How to you turn off the eddi - just flick the switch on the wall ? Also any chance of me getting electricuted off the solar if i turn of the mains before i open up that thermostat :)

dmigsy

Sounds like the immersion thermostat is either set way too hot or it is not working. The immersion should only heat the water up to the set temperature. We have ours at 60 degrees. The eddi doesn't heat the water. It just sends solar power to the immersion if the immersion needs it.

I'd turn off the eddi until this problem is fixed. Sounds like he needs a plumber.