GENERAL
TROUBLESHOOTING
Malfunction
 Compressor will not
Start – no hum
Possible Cause
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 Compressor will not start
hums but trips on overload
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2015JA0008
Solution
Line disconnect switch open
Overload protector tripped
Control stuck in open
position
Control off due to cold
location
Wiring improper or loose
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Improper wiring
Low Voltage
Start capacitor defective
Relay failed
Compressor motor has a
winding open
Internal mechanical
problem in the compressor
Liquid refrigerant in
compressor
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Check power from outlet. Unplug and
plug in unit.
Replace fuse
Replace the Overload
Repair or replace control
Re-assure the control probe location
Check wiring against diagram
Check wiring against diagram
Find out the reason & correct
Replace the start failed capacitor
Replace the failed relay
Replace compressor
Replace compressor
Add crankcase heater and / or
accumulator
GENERAL
TROUBLESHOOTING
Malfunction
 Compressor starts, but does
not switch off of start
winding
Possible Cause
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 Compressor starts and runs,
but short cycles on the
overload protector
2015JA0008
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Solution
Improper wiring
Low voltage
Relay failed
Run capacitor failed
Excessive high discharge
temperature
Compressor failed
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Excess current passing
through overload
Low / unstable voltage
Overload failed
Capacitor fault
Excessive discharge
Suction pressure too high
Compressor overheating
Compressor electrical fault
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Check wiring against diagram
Find out the reason & correct
Replace relay
Replace capacitor
Check for over charge or condenser
blockage / condenser fan failure
Replace compressor
Check wiring diagram for wrong
connections of electrical components
Find out the reason & correct
Replace overload
Replace capacitor
Check for over charge or condenser
blockage / condenser fan failure
Check refrigerant charge
Replace compressor
GENERAL
TROUBLESHOOTING
Malfunction
Possible Cause
Solution
 Units runs OK, But short
cycles
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Overload protection
Thermostat
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Check the wiring
Replace the overload
Change the thermostat setting if
required
 Unit operates long
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Less refrigerant
Probe location
Excessive load
Evaporator coil iced up
Restriction in refrigeration
system
Condenser is dirty or blocked
Filter is dirty
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Fix leak & add charge
Correct the probe location
Replace with larger system
Defrost
Determine location and clean
Clean condenser
Clean / Replace filter
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Control setting at warm
Inadequate air circulation
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Reset the controller setting to colder
Improve air movement
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Warm temperature
2015JA0008
GENERAL
TROUBLESHOOTING
Problem
Possible Cause
Solution
 Blowing Fuse
 Power cord is cut and grounding
out
 Defective Compressor
 Defective Overload
 High Voltage
 Low Voltage
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Replace power cord
Replace compressor
Replace overload
Correct voltage condition
Ensure cooler plugged into
dedicated supply with properly
sized circuit. (Correct voltage
condition)
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Determine reason or replace if required
Correct the charge
Suction line frosted
 Leaking Water
2015JA0008
Evaporator fan not working
Overcharged system
 Very Humid Conditions
 Blocked Drain
 Door not sealed properly / Top
door seal
 Clear blocked drains??
 Repair/Replace door gaskets,
realign/seal doors.
GENERAL
TROUBLESHOOTING
Problem
 Evaporator Freeze
Up
 Controller miscommunication
2015JA0008
Possible Cause
Solution
 Temperature Controller set too
cold
 Blocked/Restricted Air Flow
 Defective Evap Motor/ Running
at low speed
 Blocked Drain
 Low refrigerant charge
 Open Door or door not sealed
properly
 Defective or open gasket on
Cooling
Deck
 Deck not in locked position
 Adjust to higher temperature
setting (lower number)
 Remove source of blockage
 Replace Evap Motor
 Internal controller failure
Voltage spike
 Replace Controller & Probe
 Clear blocked drain
 Repair/Recharge system
 Repair/Seal air leaks Replace
defective or damaged gasket
 Lock deck in position and secure
with locking bar