Without naming the customer, we have several mini splits inside a sugar factory in the Northern part of MN where they grow sugar beets. These mini splits are used to cool electrical control rooms and the "outdoor" unit is generally just out in a hallway and rejects heat out into to the plant. Last week I serviced one of these units and ended up removing the reversing valve and just welded up the correct lines so the thing was permanently on "cool." It ran well for a day and now there is just blinking lights that just say "Craig, beat me with the big hammer and put me out of my misery." UGGHHHHHhhh...how do you troubleshoot these things? I downloaded a cheat sheet and every other option is "new board." Just write it up for a new board and hope for the best???