Plastic piston slider & wax thermostat
The slider should not break as it is covered mostly by the front cartridge and the thermostat is not faulty given what is happening.
Answered 5 years ago by Barrie Seabright
The hot cold issue doesn't sound like a wax capsule fault.
Thermostat test below
www.youtube.com/watch?v=x5f_E91IkKk
Answered 5 years ago by George Thomson
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