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blinking and
beeping,
temperature
high or not
cooling and
running
continually
b. Room too large
c. Ambient temperature too high
d. Exhaust restricted
e. Malfunctioning fans
f. Improper evaporator or
condenser airflow
g. Dirty Condenser
h. Iced evaporator
i. Refrigeration system restriction
j. Refrigerant leak
k. Undercharge or overcharge
l. Failed components
door opening
b. Check for excessive size
c. Check for installation location
d. Leave minimum 3 feet clearance for
the exhaust side and leave
minimum 1 foot clearance for the
fresh air intake side
e. Check for both evaporator and
condenser fans
f. Check for air restrictions
g. Clean condenser
h. Defrost and reset temperature
i. Call service for checking
restrictions
j. Call service for checking loss of
refrigerant
k. Call service to add or remove
refrigerant
l. Check compressor windings, start
relay and overload protector
7.Unit running
too long
a. Improper room insulation & seal
b. Exhaust restricted
c. Room too large
d. Ambient temperature higher >
90
°F
e. Dirty Condenser
a. Check for insulation, gasket and
door opening
b. Leave minimum 3 feet clearance for
the exhaust side and leave minimum
1 foot clearance for the fresh air
intake side
c. Check for excessive size or increase
setting
d. Check for installation location or
increase setting
e. Clean condenser
8.Fan motor
running but
compressor
not running
a. Post-compressor fan running
mode
b. Incorrect power supply
c. Incorrect or loose wirings
d. Failed components
e. Liquid refrigerant in the
compressor
a. Check for fan running time FON
b. Check for proper voltage
c. Check all wirings and connections
d. Check start relay, start capacitor,
overload protector, compressor.
e. Call service for OEM information.
9.Compressor
running but
fan not
running
a. Fan blade stuck
b. Incorrect or loose wirings
c. Failed motors
a. Check for proper clearance
b. Check all wirings
c. Call service for checking open or
shorted windings
10.Evaporator
Icing
a. Evaporator air flow restriction
b. Not stopping due to air leak, high
ambient temperature or low
setting
c. Low ambient temperature
d. Bad thermostat or sensor
e. Moisture in the system
f. Refrigerant low or leaking
a. Check for fans
b. Check for seal, door opening,
ambient temperature and setting
c. Defrost unit
d. Check for thermostat and sensor
e. Working initially then stopping
f. Check for current and sealed