I have a FHP SX060 Genisis IV, horizontal ground loop system, installed 1996. I have never had any problems with it until now. My problem is the compressor contactor kicks in but the compressor does not come on. Sometimes it comes on in 1st stage, but never in 2nd stage. All we hear is a humming noise coming from the contactor. This last for about 5 sec and then the contactor kicks out and the control board flashes fault code "7". The contractor who installed it came out and said the start and run capacitors were bad and replaced them. Same thing. He now said he doesn't know what the problem is and is going to call FHP tomorrow. I told him before he came out that it was falshing fault code "7" but he can't find his manual to look it up. Can anyone tell me what the fault code is and any hints on what the problem may be. It is Thursday night and he will not be able to come back until Monday. I've been running on heat strips for a week now. I'm contemplating calling another sercive company but there are not to many locally who deal with geo units or FHP units.