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