System ck on carrier maxima 1000

[deanCool]

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

[IRMechanik]

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.

[cadwaladr]

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.

[deanCool]

Cheers guys mainly work on Thermo King will check sensors