This question is regarding Mira Sport Max - Shower Spares

Low Flow Light On, No Temp Change

I am a complete amateur and Just moved into my first property with a Mira sport max electric shower 10.8kw. Occasionally when turning it on to medium or high setting, the back lights switch off and the low flow light comes on. Water still runs but stays cold. When in low mode it functions fine (lights stay on normally & no warnings) but the water doesn't get any warmer on this setting anyway, so useless. I have looked in the handbook and the Mira webpage and they suggest to call my water provider as it is due to low water pressure?! However my mains pressure in all taps seems completely fine, (fill a liter jug in 3 seconds and the shower is powerful working or not). Before I bother south west water and essentially get chinned off, I thought I would research elsewhere and I seem to be getting the impression of testing the continuity of the thermal switch and other components may give me an answer, however as the problem happens randomly and remedies itself after 30 minutes too an hour would the continuity test give me any results or is it something else? One other confession on first moving into the house I had the shower on high and the highest heat setting and left it for about 5mins, on returning it had shut off in a similar way no heat but the overheat light was on rather than the low flow. Could have this started the problems? Any advice would be greatly appreciated!
Asked 7 years ago by Thomas

The things to check first are:

1 That the main valve coming into your house is fully open.

2 Then check that the valve on the line to the shower is fully open.

If these valves are not fully open then there may not be enough water getting to your shower to cool it properly, it overheats the safety device cuts in (TCO) and turns the power off to the elements until it cools down and it all starts again!


Make sure that the shower head is clean and clear, that the hose isn’t kinked (this can happen just behind the hand set where it is difficult to see) also check the inside of the hose although it can look OK on the outside it could have collapsed internally


The other possibility is a faulty flow valve not allowing the correct amount of water into the shower, but before you start replacing anything I think Mira will be right contact your water authority.


Answered 7 years ago by George Thomson

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