Hot water
After that it is the cartridge I am presuming that you have roughly equal press ures on the hot and cold?
If for example you have the hot of a combi and the cold from a tank in the attic this could cause the same problem.
I mention this because most cartridges fail cold, however a cartridge failing hot is not unheard of!
Answered 4 years ago by Anonymous
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Bristan Artisan Thermostatic Bar Valve - Ar2 Shxvoff C
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