This question is regarding Aqualisa Aquavalve 609 Thermostatic / Colt / 409 Manual - Shower Spares

too hot then too cold

Fitted new thermostatic (grey) cartridge for old due to leak problem, leak solved. But now the water fluctuates when set at single point; sometimes too hot, sometimes cold (but not ice cold). Faulty cartridge or something else wrong?
Asked 4 years ago by Anthony Taylor, Leicester
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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