System ck on carrier maxima 1000

Any one any ideas why unit randomly shutting down on electric stby " system ck " comes on screen. Charge rate ok. Sensor fault. Any help or guidance much appreciated

Usually system ck is caused by suction pressure reading in the negatives for five minutes. Corrosion in the wiring / plug or bad transducer can cause an intermittent code. Could also be discharge air sensor reading higher than return air in cool.

Call up the suction pressure on the screen and watch it if it goes negative it will shut down I take it that it's defrosting enough for its load requirements.

Cheers guys mainly work on Thermo King will check sensors