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Hi again. Thanks for the replies. Apologies if my explanation of the problem is a little confusing.....Like I said, with CH ON HW is fine. With CH set to OFF the system works fine until the FLOW and RETURN pipes get incredibly hot and at some point the overheat thermostat must trip, cutting off...

Hi. I've just moved into a new property which has the above combi bolier. Have had a couple of problems over the past week: 1. When CH is ON HW runs fine but it's summer so don't want CH on 2. When CH is OFF HW seems to work fine but eventually the overheat thermostat kicks in - seems the...