Good morning to all,
My heat pump (Lennox XP15-048) was installed three years ago and I have had it serviced by the Co. that installed it. During the last service (June 2011) the technician said the refrigerant - (Freon 410A) needed to be topped up and he put in 12 ozs. After that I used the system for about a month and then it was shut off or unused over the next two months on account of vacation and no need for either cooling or heating. When I turned on the heating in October it did not work. The service technician checked the system and reported that most of the gas had leaked out. He found a leak at the "suction pressure switch" (thru a Freon detector and verified by bubbling of soap solution at valve). He said that no part was defective and that such leaks although infrequent or rare, could happen as part of "normal" operations e.g. vibration of machine. Subsequently, the 3 lbs of gas remaining was recuperated, the system was cleaned out with Nitrogen, vacuumed and refilled with 16 lbs of Freon 410A - all of this with 4 hrs of labour. Needless to say including the cost of the Freon at $$$$/lb I was presented with a large bill.
My question is - if no part was found to be defective then how likely is it that such a leak could occur under normal conditions as opposed to improper sealing/tightening during the previous service call in June? I would appreciate your expert opinion and advice. Thanks.