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Sime hot water?

Boiler Sime Planet 100e Combi boiler.
The hot water delivery varies from hot to cold. The diaphram in the diverter valve was changed 2 years ago. The problem this time is I do get hot water but the temperature varies hot, cold, hot.
Regards
Golfwyse, September 2007
blocked heat exchanger or dodgy thermistor perhaps

mrgas, September 2007
link Click here to see other fixes for Sime.