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Voltage is too low
Fan motor winding
fault
Low Voltage
Protection Switch
Fault
Expansion valve is
too small
The expansion
valve bulb failure
or incorrect
mounting position
Low-
Lack of refrigerant
pressure
in the system
protection
alarm
Filter clogging
dried
Evaporator
frosting
Evaporator surface
fouling
Air volume is too
small
Low-voltage
protection delay is
not set correctly
High
The upper
temperature
temperature limit
alarm
is unreasonable
Unit Load Design is
too small
Check input power
Check whether the motor
windings normal
Replace the low protection
switch
Appropriately adjusting the
opening degree of the expansion
valve
An expansion valve replacement,
and proper installation position
bulb
Tim refrigerant charge control in
the low voltage 0.9~1 Between
Mpa
Replacing the filter was dried
Respond to the evaporator to
defrost
Cleaning of the evaporator
evaporation surface
Check that the air filter is clogged
and a return air conduit
Readjustment of the low-
pressure time delay
Reset
An examination refrigerated
space sealing the case, if
necessary, additional equipment
23
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