Hello fellas. Sorry I haven't been back on for a while but apparently the site have ordered a new controller from us because they're sick of the problems they've had with it. I went back to site after 3 days and when I switched it back on it started running!! When I checked with another one of the engineers he said he noticed a capacitor on the board getting really hot and I suspect this is what was stopping the processor resetting when it gets isolated, but again I'm sure it's all down to the water in the pit. Thanks for all the suggestions lads.....speak to ya all soon......peace brothers!!!!