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how can i fix my Ariston microgenus 23mffi?

When having a shower the water temperature is good then intermittently turns cold for maybe 10 seconds then returns to normal, worse when weather cold.
Jim Dempster, December 2011
Its not the shower..it happened to me with this boiler. It started leaking badly too and my plumber changed the pcb. solved the problem.

Bea, September 2012
its the shower not the boiler

b, December 2011
link Click here to see other fixes for Ariston 23MFFI.