This question is regarding Redring Plus 8.5kw Extra (53594001) - Shower Spares

No hot water

I have purchased your £10 multi-meter to try to find the fault wih our Redring Plus Extra shower dated 1999. The water is cold and there is a buzzing noise. A resistance test on the solenoid valve gives a reading of 3.95 ohms. I think this is okay. A resistance test on the two elements gives readings of 16.2 and 12.5 ohms. I think this is okay. I have done a continuity check on the TCO. The meter does not bleep as the more expensive meter does in your video, but the reading changes from 1 to 000. Is this a pass or fail? Similarly, a continuity check on the solenoid valve gives a reading of 000. Is this a pass or fail? Is there anything else I should check?
Asked 6 years ago by Andrew
From your description I think you have a faulty TCO

Answered 6 years ago by George Thomson

Thanks for your response. I am not sure how to use my multi-meter. Does a reading of 000 mean there is no continuity? If so, in addition to the TCO, has the solenoid valve also failed? Do you recommend replacing the TCO first as this is the cheaper part?

Answered 6 years ago by Andrew Lloyd

From your readings I think your solenoid is OK and the TCO is at fault.

Answered 6 years ago by George Thomson

I have fitted the new TCO which you sent me. The water is now luke warm but the flow reduces to almost nothing when the temperature control is turned towards maximum.

I have tested the old TCO and the meter gives a reading of 000. What does this mean?

There is still a loud buzzing noise.

I have now noticed that the temperature control valve housing is leaking with a constant drip.

What should I try next?

Answered 6 years ago by Andrew Lloyd

Aa! Ha! so what has happened is one of the elements failed.

Just as they fail they literally blow the side out of them self which releases a tremendous amount of heat this extra heat takes out the TCO now you have fitted the new tco the shower is working but only on one element, therefore this means you need to replace the elements

Below is a link to the tank assembly which includes the elements.

www.showerdoc.com/redring-tank-assembly-plus-extra-8-5kw-93590706

Now I have to be honest it kind of depends on the age of the shower if it is worth fitting new elements or just to bight the bullet and think about a new shower.

Answered 6 years ago by George Thomson

I am coming to the same conclusion. The shower is almost 20 years old. Can you recommend a replacement shower which would be easy for me to fit and be compatible with the existing cable entry (mid / top right), water entry (bottom right), and screw fixings to the wall. A simple, low cost unit will be fine for now, as we intend to refurbish the entire room in the next year or two.

Answered 6 years ago by Andrew Lloyd

The Creda (Redring) below is fairly cheap and has multiple entry points, below the main image is a drawing of the internals.

www.showerdoc.com/creda-vitality-plus-8-5kw-electric-shower-cvps85

Answered 6 years ago by George Thomson

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