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It's a microgenus 23 MFFI by Ariston.... a bit of a dog I know but I'm too broke to change it. I guess it's probably 6 years old. So let me get this straight.... Taking the head off a TRV (presumably the cap bit) is different from just putting it on maximum.

Hi, Very quick question from a complete idiot who really should know the answer. Is a thermostatic rad valve on maximum temp the same as having a regular lockshield valve that is fully open or will the TRV still kick in at high temp and restrict water flow. The reason I ask is because...