
QBD COOLING SYSTEMS INC.
QBD.COM
29
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Always use QBD supplied OEM parts only. Use of non-OEM
parts will not only void the warranty but may also lead to a fire,
explosion, serious injury or death.
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Only trained and certified technician, for Hydrocarbon
systems, should service these coolers.
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Use extreme caution and follow all local/regional codes for
transportation or relocation of Hydrocarbon coolers.
Blowing Fuse
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Power cord is cut and
grounding out
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Defective compressor
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Defective overload
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High Voltage
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Low Voltage
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Replace power cord
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Replace compressor
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Replace overload
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Correct voltage condition
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Ensure cooler plugged into dedicated
supply with properly sized circuit.
(Correct voltage condition)
Suction line frosted
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Evaporator fan not working
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Overcharged system
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Determine reason or replace if
required
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Correct the charge
Leaking water
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Very humid conditions
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Blocked drain
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Door not sealed properly /
top door seal
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Clear blocked drains
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Repair/replace door gaskets,
realign/seal doors
Evaporator freeze up
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Temperature controller set
too cold
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Blocked/restricted air flow
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Defective evap motor/
running at low speed
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Blocked drain
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Low refrigerant charge
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Open door or door not
sealed properly
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Defective or open gasket on
cooling deck
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Deck not in locked position.
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Adjust to higher temperature setting
(lower number)
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Remove source of blockage
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Replace evap motor
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Clear blocked drain
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Repair/recharge system
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Repair/seal air leaks. Replace
defective or damaged gasket
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Lock deck in position and secure
with locking bar
Controller
miscommunication
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Internal controller failure
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Voltage spike
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Replace controller & probe