[furnacemaninc]

I have beeb working on a new EMI 3x multi heat pump. I replaced the reversing valve and operation to the unit was restored, the following month the same thing happens, once again the the valve was replaced and operation was restored, here we are 3 months later and the unit is down again. all repairs were performed with a nitrogen purge, 3 evac, heat paste and a wet wrap on the valve. I have never in 13 years had a revesing valve go out more than once. The only explaination would be a bad batch of valves made at the factory, but those odds are slim. any ideas?

 

[furnacemaninc]

The valve would not switch out of the heating position, when the coil was energized i could hear the pilot valve click, i
I also confirmed the refrigerant charge was ok. Both valves and refrigerant looked clean. New drier installed with every valve.
what could cause oil migration?I don't think there are any metal shavings in the unit, unless they were already present when we received the new unit. the indoor coil is no more than 3' higher than the outdoor coil with about a 50' lineset.

Thanks for the help

 

[furnacemaninc]

Yes I tried closing one of the service valve,but no luck, what if I have too much oilin the compressor? I was thinking about changing the comp oil at the same time as the valve.