Hot water goes hot cold hot cold

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Ariston microgenus 27MFFI.
Yeah yeah 2ndry hex. So I changed it, and the sensors.
Happy showering restored, for about a week, then much the same. Variable they say, some times it's better. The removed one wasn't particularly awful though plenty of small black flakes to shake out. (it was also letting-through)
I've never known one re-block so quickly. :confused: Am I missing anything?

No diaphragm to be dodgy, it's the flow sw and motorised DV type.
 
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Did you check the eye of the pump?

Did you wash through the system ?

Tony
 
Can usually wash through using the PRV and filling loop with one boiler iso valve closed on the return.

Tony
 
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Chris you mention shower and not taps are you sure it is not thermostatic cartridge in shower playing up.
 

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