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Saunier Duval Thema F 23 E hot water not working?

Saunier Duval Thema F 23 E
needs attention because the hot water is not hot. It was suggested that it needs descaling is this likely and if so how do I do it?

MHRP
January 2008
Saunier DuvalHeating, Home Heating SystemsF 23 Not
This is something you will not be able to do yourself. You will need to get someone in to descale the system. Usual prices for a complete central heating and boilder system decale are around £400.

Ali
April 2008

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