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Ferroli optima 900, shower keeps going hot and cold?

When running a bath or having a shower when both hot and cold taps are on, the water keeps running hot and cold approximately every 30 seconds ish, any ideas?
Thanks
Bob, January 2009
Sounds like the Thirmister, change the two , central heating and hot water one.
Paul

Paul, January 2009
link Click here to see other fixes for Ferroli.