hi there just incase any one has the same prob
our Indesit dryer has been tripping the rccd on occasion's, would leave it for a few days to dry out and all would be well, by the time the engineer would arrive it always worked.
when it was playing up it would start for a fraction of a second and then Tripp the rccd.
so i removed the heating element mounted in the steel blister at the rear of the machine and found that a sticky residue of fluff had built up around the terminals at either end of heater and bridging over to the chassis, so it appears that once this fluff became damp enough it would allow current to pass through, setting of the rccd.
all i did was to gently clean around the terminals with cotton buds and clean with electrical contact cleaner.
and all is well.
remember to isolate power and don't use wd40 as it is flammable and conducts electricity.
thanks to all above for pointing me in the right direction.
Thanks Scott
Scott
March 2007