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Well looking for help again.Got asked to have a look at an immersion heater that trips the rcd as soon as it reaches set temp.This can be set at 50 degrees to 90 but as soon as it gets to the temp off goes the rcd.Have cheaked ir on cables back to board no problems,restance of dual elements 1 8 ohms and 35 .4 core heat resestant flex from heater switch to immersion heater,wired as gn/ye to earth blue to thermostat blaclk to bath element brown to sink element. Have cheaked thermostat is switching at different temp. Any more ideas as to problem. Thanks