This question is regarding Mira Elite ST - Shower Spares

Water goes cold 30Sec after warming up

Hi, I've got a Mira Elite ST 9.8Kw unit, which has developed a fault. Turn it on, good flow, water warms up as normal, then 20-40 Sec it goes cold. I can tell that power is switched off to heater as pump speeds up ever so slightly. At this point it goes cold, but still has a good flow. After a delay it will start to heat water again, then repeats the cycle.

I have cleaned the filter, slight amount of sediment was present, this didnt fix the problem.

Which part should I replace to fix this?



Another question, will a 10.8Kw unit fit in place of a 9.8Kw unit?
Asked 11 years ago by Andy

I think you may have a faulty Thermal Cut Out (TCO).

A faulty TCO will have no continuity across the two terminals (The black thing on top of the heating tank)

Therefore a good TCO will have power at both connections and a faulty TCO will have power at only one.

(The function of the TCO is, if the water over heats it cuts the power off to the elements until the water cools, this can take up to 15mins)

See Video:

http://www.youtube.com/user/showerdoc#p/u/2/_zi8JbEMYMs

After fitting a new TCO

When fitting a new TCO listen to the shower, after it has completed its first on/off cycle, if when it is switched off you hear it continuing to heat (Noise like a kettle starting to boil) this will mean that there is a switch or a relay that is stuck in the on position, this is keeping an element energised and this is probably what caused the original TCO to fail.

If this is the case replace the faulty switch or relay and make sure that you switch the shower off at the isolating switch when the shower is not in use because this may cause the new TCO to fail.

Answered 11 years ago by Anonymous

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