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Message: <blockquote data-quote="joddle" data-source="post: 918985" data-attributes="member: 247983"><p>I would suspect a combinaiton of the air con cutting out and earthing problems - especially if one of the air con units is casuing problems.  Why is it cutting out? That needs addressing firstr Then why does it blow the LNB? - my guess is a high voltage spike due to bad earthing on one or even both properties - and possibly made worse by different phases! Even if on the same phase, high earthing resistance between the properties could generate quite a high voltage difference when the air con trips as it would act a be a bit like a pulse casuing a high voltage spike. I have often measured upwards of 30v across neutral and earth within a badly earthed property and so differences across two properites due to a pulse could be much much higher.</p></blockquote><p></p>