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Mend Ferroli OPTIMA 900 Heating Hot Water Optima

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

Ferroli Ferroli OPTIMA 900 Heating, Home Heating Systems Heating Hot Water Ferroli Optima

Sounds like the Thirmister, change the two , central heating and hot water one.
Paul

Paul
January 2009

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Ferroli Optima 900: Hot & Cold Water Issue