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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

home Fix label Heating label_important Home Heating Systems category Ferrolidone

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

Paul, January 2009

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home Fix label Heating label_important Home Heating Systems category Ferroli

Ferroli optima 900, shower keeps going hot and cold?

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Ferroli optima 900, shower keeps going hot and cold?

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Ferroli optima 900, shower keeps going hot and cold?

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