My Heatline viso 24 will not heat the DHW to a decent temp?

I have the same problem though in my case the red LED on the front panel is flashing. I need to replace the DHW sensor, when this sensor fails the boiler will carry on supplying hot water but restricts it to 64degs cent. only. It does this by using the flow sensor and CH sensor to regulate the temp. at the taps

charlyfarly
May 2010