I got my butt kicked by a KM-1300SAF today. I'm a 6 year hvac tech with no experience on ice machines. The board had been going into a 3 beep alarm. I checked the FS, water inlet solenoid, and check valve, all seemed okay. I was getting tech support from a guy who told me to change the hot gas valve. After doing that I started it up and was running a high head pressure. I had already sprayed the coil out with nitrogen as much as I could until the people in the store yelled at me, than I pulled the fan and brushed the rest out. My pressures(404A) five minutes into the freeze cycle were 325 and 59 with 83 degree incoming water and 82 degree ambient air. 35 minutes into the freeze cycle my pressures were ranging from 300-310 high and 41-45 low. The machined limped out a freeze cycle in 50 minutes.
I'm wondering if anybody can give me some tips about checking txv's, hot gas valves, and water solenoids for leaks. I'm also thinking the condenser coil could have been a little cleaner. Does anybody have any tips for cleaning a condenser coil without spraying dust over everything? If I spray it with water the water will leak everywhere and the coil housing is so tight I doubt a shop vac could reach everything.