This question is regarding MX Bullet Thermostatic Brass Bar Mixer, Valve only (Chrome) - HMJ

water at times run cold,

sometimes the shower goes cold and then it comes back again, the worcester boiler was serviced prior to installation
Asked 6 years ago by Edwin
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 Barrie Seabright

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