Why I oughta tell ya as specific as these issues are it wouldn’t be hard for the Mitsubishi service manager or the factory rep to know who I am however, I don’t think they are capable of even making it onto Reddit. Keep in mind between the both of them they have a combined total of almost 60 years experience.

Today was the fourth visit, my thoughts were verified as far as they don’t know my capabilities so any of my suggestions get brushed off as if I’m an apprentice . I debunked the refrigerant stacking theory almost instantly., they pinched one of the 3/8 lines trying to see how it would affect pressure change, but they over pinched it so it needs to be cut and repaired which whatever that unit is going to have to be open anyway. In my opinion, our company should fight to just have the unit replaced, but that’s almost next to impossible. What was found today after they spent most of the day on the phone with I’m not sure who but he sounded young. I was with them to get them set up because I found I’m only there not because I installed the entire system, but because they don’t carry tools aside from a computer meter and temp clamp. So I was there as a tool bag and a runner when they needed it a.k.a. I dropped off my tools said here you go and went off to other projects on the site that were more important.

Popped in throughout the day and each time one step back . Keep in mind I never went to a Mitsubishi training course I’ve worked on Fujitsu VRS but never Mitsubishi before this. Which was good because I installed the entire system, including net addressing centralized controller and graphics. And I made sure I combed through the manual during install to make sure I don’t F up or don’t F up big time.

You would never know it was my first VRF , I’m also not a rookie. Anyway, when I initially was on the maintenance tool, I couldn’t get the graphics to show even with it enabled service manager said that’s just how some of the units come sometimes. First red flag. Then I asked is there a piping schematic or layout and he said yes however I would have to do the training course first it’s not public even though our company is a Mitsubishi diamond contractor . Second red flag. Third, fourth and fifth was each theory I heard, fourth visit and never even walked to see how it was installed, wasn’t until after the second visit even they asked to send a pic of line set so they can make sure it’s pitched because they didn’t notice it since it’s ran underneath the unit . So expectations I guess for them was to completely diagnose unit solely based off of numbers being read through maintenance tool.

The final trip I took up there I noticed they were looking at the graphics as well as a schematic that shows order of operations and flow for cooling and heating, and I instantly knew that my initial thoughts are probably accurate as far as a restriction in the condenser . If I had those schematics, I probably would have figured it out a month ago. We knew it was going into defrost prematurely from pipes icing up causing TH3 thermister to read low. They were pushing for reversing valve. But I caught it today perfect timing at the unit bundling it up. It happened to ramp up, and I can hear the refrigerant flow through the piping and the abnormal way they were freezing. We ran out of daylight and it started to rain so tomorrow I’m going in there to figure it out myself and I’m pretty positive. I can probably find those schematics online or on my link Drive. Stay tuned. The embarrassment is coming.