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Thanks Seco. Tried turning on hot and cold several times and it didn't make a difference. Also, there is no evidence of limescale in the cartridge. Does it sound more like a cartridge problem than a boiler problem?

I am sure this has come up before so apologies if there is already a solution. My Clearwater thermostatic shower (and bath) will not get hot but the kitchen and bathroom basin taps are more than hot enough. Someone suggested it may be a diverter problem with the boiler. But if other taps...