58
Troubleshooting
Service Manual
SKOPE BackBar X
Unit operates long or
continuously. Unsatisfactory
cabinet temperature.
• Short of refrigerant.
• Fix leak, and add charge.
• Overcharge of refrigerant.
• Remove refrigerant to correct charge.
• Chiller has excessive load.
• Establish load within limits.
• Evaporator coil iced.
• Defrost evaporator. Check evaporator
probe. Check refrigeration, Check
thermostat. Check elements. Check
door closing, seals etc.
• Electronic controller not
operating correctly
• Diagnose fault with controller and
service as necessary (see page 10).
• Restriction in refrigeration
system
• Determine location and clear
restriction. Flush with dry nitrogen.
Replace component if blockage will
not clear.
• Dirty condenser
• Clean condenser. Advise client how to
regularly clean condenser.
• Inadequate air circulation
• Internal: Improve air movement, allow
airflow around stock.
External: Remove any restrictions to
condensing ventilation.
• Compressor not pumping
efficiently
• Replace compressor.
• Filter dirty (if applicable)
• Clean or replace.
• Faulty fan motor
• Check rotation. Replace if necessary.
• Electronic controller not
operating correctly
• Diagnose fault with controller and
service as necessary (see page 10).
Start capacitor open, shorted
or blown.
• Relay contact not opening
properly.
• Clean contacts, or replace relay if
necessary.
• Prolonged operation on start
cycle due to:
(a) Low voltage to unit.
(b) Improper relay.
• (a) Determine reason and correct.
(b) Replace relay.
• Excessive short cycling.
• Determine reason for short cycling,
and correct.
• Improper capacitor.
• Determine correct size and replace.
Relay defective or burned out.
• Incorrect relay.
• Check and replace.
• Line voltage too high or too
low.
• Determine reason and correct.
• Excessive short cycling.
• Determine reason, and correct.
• Relay being influenced by
loose vibrating mount.
• Remount rigidly.
Suction line frosted.
• Evaporator fan not running
• Determine reason and correct
• Overcharge of refrigerant
capillary systems
• Correct charge
Unit noisy.
• Loose parts or mountings
• Find and tighten
• Tubing rattle
• Reform to be free of contact
• Bent fan blade causing
vibration
• Replace fan
• Fan motor bearing worn
• Replace fan
Problem
Possible Cause
Suggestions
