Sub-Zero PRO 48 Use & Care Manual page 28

Troubleshooting Guide
Troubleshooting
If your PRO 48 unit is not operating properly, use the
following troubleshooting guide before contacting
Sub-Zero factory certified service. This guide will save
you time and trouble and may help you avoid the expense
of a service call.
'SERVICE' is illuminated in the exterior temperature
display.
• The microprocessor has sensed a problem with the
operating system. There may be instructions in the
exterior temperature display to solve the problem. If
not, call Sub-Zero customer care at 800-222-7820.
'SERVICE' is flashing in the exterior temperature display.
• This happens when one or more of the zones runs
too long, or a temperature sensor may be faulty. This
could be from a dirty condenser. If this occurs, clean
the condenser as outlined on page 13. Turn the unit off
with the POWER key pad and then restart by pressing
the key pad again. If 'SERVICE' is still flashing, call
Sub-Zero customer care at 800-222-7820.
'SERVICE' and ice lights are both flashing.
• This occurs when the solenoid valve for the ice maker
is activated too long. Check for excess water near the
ice maker. If you see excess water, turn off the water at
the shut-off valve and call for service. If there is no
excess water, turn the unit off and back on to reset and
see if this corrects the problem. If the problem contin-
ues, call Sub-Zero customer care at 800-222-7820.
Refrigerator / freezer is not running.
• Is there electrical power to the unit and is the home
circuit breaker on?
• Is the refrigerator/freezer control on?
• Is the condenser area clean?
• Has a door or drawer been left open for an extended
period? Be sure that food is not obstructing proper
door or drawer closing.
• If the unit is still not running, it may be in defrost mode.
Wait 30 minutes and try to restart again.
Refrigerator / freezer is warmer than usual.
• Is the control set properly?
• Is the condenser area clean?
• Has a door or drawer been left open for an extended
period? Be sure that food is not obstructing proper
door or drawer closing.
• Has a large amount of food been added recently?
Refrigerator / freezer runs for long periods of time.
• Is the condenser area clean?
• Has a door or drawer been left open for an extended
period? Be sure that food is not obstructing proper
door or drawer closing.
• Has a large amount of food been added recently?
• On hot days and in warm room temperatures, the
compressor runs longer.
• There may be normal operation noises related to refrig-
erant circulation, fan operation, ice maker operation,
defrost cycle or compressor operation.
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