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Installation & Service Manual
SERVICE INSTRUCTIONS
Troubleshooting Self-Contained Units
Never work on electrically powered equipment while it is energized! Electrical shock could
cause personal injury and/or death.
TROUBLE
1. Unit will not run
2. Refrigerated section
is too warm
3. Refrigerated section
too cold
4. Unit runs all the time
5. Noisy operation
6. Frost or ice on
evaporator coil
7. Water dripping from
case drain
May, 2004
All manuals and user guides at all-guides.com
WARNING
COMMON CAUSE
Blown fuse
Low voltage
Inoperative motor or
temperature control
Shelves overloaded;
blocked air flow
Thermostat set incorrectly
Pressure control set
incorrectly
Case fans not operating
Thermostat set incorrectly
Pressure control set
incorrectly
Inadequate air circulation
Room temperature
too warm
Thermostat set incorrectly
Refrigerant charge low
Loose baffles
Tubing contacting cabinet
or other tubing
Cabinet not level
Defrost clock doesn't work
Condensate drain clogged
Dissipator not functioning
N5D, N5DH, N5DL, N5DSC
REMEDY
Replace fuse.
Check outlet with voltmeter. Voltage
should be 115V or 220V (±10%).
Check connections.
Make sure items do not block the
air flow.
Check setting.
Check setting.
Check terminal block connections.
Check setting.
Check setting.
Relocate cabinet or remove obstruc-
tion. Check installation requirements.
Ventilate room appropriately.
Reset thermostat.
Have unit serviced by a qualified
service technician.
Tighten or brace baffles.
Move tubing.
Level cabinet.
Check electrical conections. Have
unit serviced by a qualified service
technician.
Clear drain.
Check electrical supply. Check
float assembly.
Page 17
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