TROUBLESHOOTING CHARTSYMPTOMS CAUSE REMEDY Close starting switch. Check 208 / 220 / Motor line open. 3 or 230 / 1 etc., power source. Fuse blown. Replace fuse. Tripped overload. Check thermal overload on motor. Pressure control stuck open. Repair or replace. Remove motor compressor head. Look Piston stuck. for broken valve and jammed parts. A. Compressor will not Frozen compressor or motor start. bearings. Repair or replace. Control differential set too closely. Widen differential. Discharge valve leaking. Correct condition. Check for high head pressure, tight bearings, stuck pistons, clogged air or Motor compressor overload water cooled condenser or water cutting out. shutoff. Shortage of refrigerant. Repair leak and recharge. Refrigerant overcharge. Remove excess. Cycling on high pressure cut- out. Check water supply. B. Unit short cycles during Discharge or suction shut-off normal operation. valve not fully open. Correct condition. Improperly wired. Check wiring against diagram. Check line voltage — determine Low line voltage. location of voltage drop. Check by operating manually. Replace Relay contacts not closing. relay if defective. Eliminate cause of excessive pressure. Make sure discharge shutoff valve is C. Compressor will not run; High discharge pressure. open. Tight compressor. Check oil level — correct binding. hums intermittently (cycling on over-load). No power on one phase. Check fuses and wiring. Low line voltage. Correct condition. Improperly wired. Check wiring. Check discharge shutoff valve. Check D. Compressor starts, runs High discharge pressure. pressure. slow. Tight compressor. Check oil level. Check binding. Increase voltage to not less than 10% Low line voltage. under compressor motor rating. E. Contactor burn — out Excessive line voltage. Reduce voltage to maximum of 10 % 17