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baxi combi 105 hot water goes cold then hot again?

when turning on the hot water the boiler strikes up but only for few minutes then turns off again then strikes up again it keeps doing this meaning the bath water is only luke warm
wayne, October 2010
dhw plate heat exchanger is the fault part no 248028 or 248723 for sale at universalheatingsparesuk e bay shop

byron universalheatingsparesuk, October 2010
sounds like plate heat exchanger is blocked up or dhw thermister faulty

geoffgas, October 2010
link Click here to see other fixes for Baxi Combi 105.