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Viper Service Manual
© 2010, IMI Cornelius Inc. - 65 - Publication Number: 621360041TBSER
Troubleshooting Product Not Cold
Problem Probable Cause Remedy
Compressor not Run-
ning
A. Barrel not in ON mode.
B. No voltage to compressor.
C. Bad start components.
D. Compressor’s thermal overload
protector “open”.
E. Open or shorted compressor wind-
ings.
F. Bad control board.
A. Turn barrel to ON.
B. Check power at contactor L1, L2 -
T1, T2.
C. Check components and wiring.
D. Check resistance of compressor
windings and check incoming line
voltage.
E. Check resistance of compressor
windings.
F. Troubleshoot, replace if necessary.
Compressor Running
but not Cooling
A. Low refrigerant.
B. Restricted condenser/filter.
C. Condenser fan motor/blade defec-
tive.
D. Hot gas valve leaking or open.
E. Defective compressor.
A. Repair leak and weigh in new
charge.
B. Clean or repair.
C. Repair or replace.
D. Replace.
E. Repair or replace.
Restricted Air Flow A. Dirty filter.
B. Dirty condenser.
C. Damaged fins.
D. Not enough “clearance” around
unit.
A. Clean filter.
B. Clean condenser.
C. Repair/replace if necessary.
D. Ensure proper spacing around
unit.
Fan Motor A. Bad connection
B. Bad motor
C. Cracked or bent fan blade
A. Check/connect
B. Replace motor
C. Replace fan blade
Hot Gas Valve A. Miswired.
B. Defective coil.
C. Defective product delivery board.
A. Correct wiring.
B. Replace coil.
C. Replace.
No/Low Refrigerant A. Leak. A. Repair and weigh in new charge.
Sensors A. Bad connection.
B. Bad sensor.
C. Sensor out of position.
D. Defective product delivery board.
A. Correct wiring.
B. Replace sensor.
C. Reposition sensor and clip.
D. Replace.