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replaced air press switch and cleaned dhw plate heat exch in acid. all works fine now. cheers all for help.

can you explain how heat exchanger would create fault as it is initially delivering hot water for approx ten minutes so water is flowing thru exchanger ok. i cannot see any temp sensors on heat exchanger itself or anything that will command the burner to go out from the heat exchanger. cheers

is that the heat exchanger at the bottom of boiler.can i clean / remove debris or does is req new part. cheers for reply

Hi all ,first post and great site. I have a 240 eco combi approx 10 yrs old. Last serviced approx 6 yr ago. The fault it has developed is that if you run a bath or shower the hot water will run cold after approx 10 mins (this varies thou sometimes 5 or 15 mins)then fluctuate between hot and...