I have 3.5 Ton Packaged 7 year old R22 Coleman heat pump. After 3 years Evap coil changed due to leaks. 3 year later Again Coil leak. At this time it is out of warranty, so 1 can stop leak 3.5 lbs r22 and 6 months later LP switch is switching unit off. Unknown if switch or leak. Last time leak freezes condensor coil. This time not freezing. Unknown right now if switch or leak or other. Circuits are all ok. Design is piston compressor, Non TEV, R22, Single york defrost board, good thermostat and wires. I believe it is rifled evaporator coil. Simple contactor for condensor fan and compressor. 1 lp switch 1 defrost sensor ( closes in freezer) No HP switch or ambient sensor. Could it be leak again ? I'll bet so. After $950 in service calls I really do not want to fix another leak. I'll bet I'll hear a tone with a gas Sniffer. Yes this was installed by an AC company and I called the same Company for service.
My question is : Hear any complaints from others about coleman coils leaking? I read others have had lots of problems with leaks on colemans. Model PHP042H1021B. for you in case it rings a bell. I read one company is involved in a law suite becsuse of this. The Contractor I used only gave Mfg warranty which is 5 years parts only. Pretty sorry but I can understand them washing their hands after Mfg warranty. I will not use them again due to their poor unit quality screening.