Occasionally we have two slow flashing lights on the Worcs Bosch 35CDi. We press the red reset button and all ok for about two weeks ! Only does it first thing in the morning, not in the evening. Pressure fine, no noises, no leaks, fully serviced last month and annually before that.

Katie - Gloucester, January 2011

If both slow flashing lights are the HW and CH lights, you have an overheat situation, possible issue with thermostats, or likely one of the pumps sticking

Carefree, January 2011