Troubleshooting – Compressor shuts down

Probable Cause Display Reading What to Do Note: If a shutdown occurs, press the DISPLAY SELECT button once to activate the display table. Using the adjacent up and down arrows, the values displayed will be those immediately preceding shutdown. Use these values when trouble- shooting a problem. "HIGH AIREND TEMP." Insure that installation area has adequate ventilation. Insure that cooling fan is operating. If not, reset circuit breaker inside starter box. Check coolant level. Add if required. Cooler core may be dirty. Clean coolers   "HIGH AIR PRESS." Check for restricted or malfunctioning blowdown valve or minimum pressure check valve.   "LOW SUMP PRESS." Check for air leak from tank or blowdown piping. Adjust sump pressure   "PRES SENSOR FAIL" or "TEMP SENSOR FAIL" Check for defective sensor, bad sensor connection or broken sensor wires.   "CK MOTOR ROTATION" Interchange any two line connections at the starter.   "MAIN MTR OVERLD" Check for loose wires. Check supply voltage. Check heater size.   "FAN MTR OVERLOAD" Check for loose wires. Check supply voltage. Fan motor overload tripped. Check for dirty cooler cores.   "STARTER FAULT" Inspect starter contactors. Check for loose wires.

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