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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
FerroliFerroli OPTIMA 900Heating, Home Heating SystemsHot Cold Water Ferroli
Sounds like the Thirmister, change the two , central heating and hot water one.
Paul

Paul
January 2009

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