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Mira Zest Shower - No hot water
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# 1
robert_harper_2000
Old 13-11-2009, 9:31 AM
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Default Mira Zest Shower - No hot water

Help, my shower first started spraying water from the control unit rather than the head. I turned off the shower's water supply and fused and got a replacement clip for the inside 4.99 instead of 200 new shower.

I now turn the shower on and the water comes out at a rate of knots! Really flowing out, the head hardly stays in the holder. Brilliant I thought a electric shower that is a power shower too. But there is no hot water ...

Do I need a new shower?
Thanks
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# 2
macman
Old 13-11-2009, 9:52 AM
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Have you got power coming to the shower. i.e. have you turned the circuit back on at the CU and at the isolator switch? With the shower off, is the pilot light illuminated on the isolator? Then switch the shower on and see if the RCD is tripping out straight away.
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# 3
robert_harper_2000
Old 13-11-2009, 10:05 AM
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thanks macman. I don't quite know what you mean, the electric shower only works when there is power going to it as I know when I pulled the switch above it the red light went off and the shower wouldn't work.

I have pulled the cord since and now the red light is on and water comes out but not hot.

What were the other checks? With the boiler did you think?
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# 4
macman
Old 13-11-2009, 10:12 AM
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The boiler has nothing to do with your electric shower, it is cold fed from the rising main. You obviously have power to the isolator switch, do you have power to the shower itself, i.e. does a light come on on the control unit when you switch it on? The element may have gone, or a number of other things, possibly you may have damaged something when you replaced the part.
I suggest you get a qualified electricain in to look at it.
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# 5
robert_harper_2000
Old 13-11-2009, 10:17 AM
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damn I thought I'd saved 200 but guess things are never that easy!

There isn't a light on the unit only on the switch above it which is always on. Perhaps I damaged something as you say.
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# 6
macman
Old 13-11-2009, 10:31 AM
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A new one should be about 100 depending on the power rating.
With the water flowing, and the isolator on, what happens when you close the isolator?-the water flow should cease.
Suggest you work your way through the fault finding chart in the manual:
http://www.plumbworld.co.uk/images/zestinstallation.pdf
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# 7
robert_harper_2000
Old 13-11-2009, 10:52 AM
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Value stops water supply. Knobs make no difference. Water supply must be ok due to the sheer pressure it is flowing out.
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# 8
macman
Old 13-11-2009, 11:01 AM
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What do you mean by 'value stops water supply? You haven't answered the question-with power on at the isolator and the shower on at the control unit, what happens when you switch off at the isolator? Does the water flow cease?
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# 9
robert_harper_2000
Old 13-11-2009, 11:31 AM
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That's weird, when I turned the isolator value to stop the water supply the shower returned to a more reasonable flow rate. I thought it was suppose to shut it off completely?
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# 10
macman
Old 13-11-2009, 11:48 AM
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What do you mean by 'isolator value'? Do you mean 'isolator valve'? The isolator is the switch controlled by the pull cord, not a valve or knob on the control unit.
Read the fault finder guide:,if water continues to flow with the isolator switch off, it indicates that the diaphragm has failed and the flow valve will require replacing.
I suspect that the original leak has shorted out the internal circuitry or blown the element.
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# 11
robert_harper_2000
Old 13-11-2009, 11:49 AM
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Sorry! The switch turned on then shower on then switch off does switch off the water.
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# 12
macman
Old 13-11-2009, 12:00 PM
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Your last post does not make any sense. You still don't say which 'switch' you are talking about. If you mean the isolator, then the diaphragm is OK and the element may have gone.
I suggest you get a qualified electrician in to trace the fault.
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# 13
robert_harper_2000
Old 13-11-2009, 4:19 PM
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sorry again! lol

If the isolator switch is on and the shower knob turned the water comes on. If I turn off the isolator value the water flow rate decreases but doesn't turn off.
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# 14
macman
Old 13-11-2009, 4:27 PM
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I repeat, the diaphragm is faulty, but I suspect you have other problems too.
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# 15
woofwoofwoof
Old 13-11-2009, 8:25 PM
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Sorry to hijack the thread Robert.

Macman, I have a mira sport shower which won't heat the water. We have taken the cover off but there is a sticker that says 'no serviceable parts' - does this mean that we have to replace the whole shower or can we replace the heating element or do you have any ideas about why else the water won't heat? Many thanks.
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