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Irregular temperature

This question is regarding Mira Excel (1990-96) Cartridge - 903.33

My Mira Select (pic attached) no longer maintains constant temperature. Flow is good.

Can you please advise:

1. Appropriate replacement part, and

2. Method of replacement


Asked 4 years ago by Anonymous

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 4 years ago by Barrie Seabright
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