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Thanks for the replies. At the moment its working fine, who knows, so I will just have to wait till an engineer can get out. I know all about Isars lousy reputation, recently had to replace the old PCB for the new orange one which should hopefully *cough continue to work.

Hello. forgive me if the following is poorly explained I’m new to the world of combi boilers. I have an ISAR HE35 condensing combination boiler. Today I had problem with the RCD tripping as soon as the thermostat was turned up. Using hot water there was no problem, it was just for the...