Mira shower
However if you have a combi boiler check out below.
Regarding the temperature fluctuation or cool running, it could be a faulty cartridge. However to check this if you have the shower fed from a combi boiler, see if you can get hold of the hot supply pipe before it enters the shower or perhaps as it leaves the boiler.
If when holding this pipe the temperature fluctuates or goes cool, then the problem is not with the shower but more likely with the boiler, as the shower can only deliver what the boiler sends to it.
Disregard the temperature at the taps as they have a different flow rate.
Answered 6 years ago by George Thomson
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Mira Atom ERD (MK1) H04B Thermostatic Valve Shower Spares (2008-2010)
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