Replaced main control board because it wasn’t sending 120 to compressor and it started working then had redo because stopped cooling for a day again and went up to 60f for a day. When new board finally sends voltage to compressor it clicks like 4-5 times revvs up several times without holding a constant run then on fourth try compressor seemed to start running good. I’m thinking maybe temperate sensors not telling the board to send voltage but why would the compressor seem to struggle to run? I’m thinking replace sensors and compressor. I ran through diagnostic everything on the board seemed to test good.
- Guest asked 6 years ago
Hello
Have you put your gauges on yet ? We have had several of the 500 and 600 series Sub Zero units with partial restrictions from compressor oil migrating into the evaporator and capillary tube. This prevents the unit from equalizing fast enough and it will cycle on and off on the overload like yours is doing. You will need to see if the compressor high and low side pressures are equalized when this is occurring . In order to correct it we had to replace the evaporator and heat exchanger. Matt Ace technician
- AV Repair Help answered 6 years ago
- last edited 6 years ago
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