WheelofDeath

We were thinking high humidity and air leaks too, but they are pretty tight and humidity has varied depending on the season and location. Replaced the oldest compressor with a new one. No change. Only happens with R-290 versions.

Haven't seen the evap motor fail yet, condenser fan motor is another story. We are seeing ice buildup on the fan shroud to the point it slows or stops the fan blade. The evaporator itself is clear of ice unless the blade has been stopped for awhile. Defrost is working as advertised. Its happening on approx 6 freezers in 5 different accounts. Strange problem

The battery backup is a weak point for Minus Forty. Have you had any issues with the Royal (R-290 version) evaporator fan motor bracket building up ice and blocking the fan blade?

The company I work for uses Royal, Imbera and Minus Forty Freezers in our Markets. The only one I can recommend from a maintenance point of view is the Minus Forty. Much more more reliable.

4 is the enter button on Coke branded machines and * on Pepsi and generic machines. You really do need to download the Coke specific and the generic manual. It will save you a lot of time.

I think he took the logic board off to get to the display board. I hope he wasn't actually removing an eprom.

There is one more easy thing to check. On the left side of the cabinet is an upper limit switch. It's a white box, two screws and a cable leading to the top of the machine. Its a couple of inches above the rod that the elevator travels on. Make sure the plastic arm is fully out. Its normally extends about an inch. Pull it out if in and do a test vend with the doors closed.

That board is toast. You have at least 3 to 4 damaged resistors, two transistors and a chip that looks like its missing a chunk or 2 from its sides.