Mira Sport 10.8kW Buzzing Noise - More Info

Thanks for the reply!

The flow valve works fine, exactly as you describe - slow dribble when set very hot, fast flow when set very cold.

The noise does not sound like an electrical buzzing. It sounds like something resonating in the water flow. I attach an audio clip of the noise - towards the end of this clip I slowly increase the temperature control towards Hot, and you can hear the noise disappear - but the water is then too hot to shower.

Same effect when decreasing the temperature.

Asked 11 years ago by Anonymous

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

A faulty TCO will have nocontinuity across the two terminals (The black thing on top of the heating tank)

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

(Thefunction of the TCO is, if the water over heats it cuts the power off to theelements until the water cools, this can take up to15mins)

SeeVideo:

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

After fitting a new TCO

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

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

If after testing the tco is found to be sound, then it is back to the PCB.

Answered 11 years ago by Anonymous

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