Airrex HSC-18PLUS Operating Instructions And Parts Manual - Self Diagnostic Codes
Operating Instruction & Parts Manual
SELF DIAGNOSTIC CODES
The alarm light is activated if abnormal operation occurs, and an error code is displayed on the control panel.
In this case, the compressor will stop operating.
Error Code
Problem
Cause
Corrective Action
High pressure
Blocked air filter
Blocked / kinked exhaust duct
Ambient temperature is too high
Ensure exhaust duct is not
blocked / kinked
Do not use the air conditioner
if ambient temperature is
higher than 113℉
Low pressure
AF sensor
RT sensor
OT sensor
If the AF sensor is short
circuited or cut 'E3&1'
displayed and the 'Error'
LED will be on.
If the RT snesor is short
circuited or cut 'E3&2'
displayed and the 'Error'
LED will be on.
If the OT snesor is short
circuited or cut 'E3&3'
displayed and the 'Error'
LED will be on.
Exchange temperature sensor
(Contact Airrex U.S.A. at 1-888-
535-8841)
Exchange temperature sensor
(Contact Airrex U.S.A. at 1-888-
535-8841)
Exchange temperature sensor
(Contact Airrex U.S.A. at 1-888-
535-8841)
Verify Electrical
Refrigerant may be low
Clean Filters and Coils
Verify Power (Voltage/Amps)
Check Filters Evaporator/Condenser
Check Evaporator/Condenser Coils
Check refrigerant level and/or
refrigerant leak.
Water full
Water tank is full
Empty the water tank
Align water tank
Water tank is not
positioned correctly
Place the water tank
in right position
Anti-Freezing
alarm
Evaporator is below 25 ℉
(-4 ℃) due to being used in a
low ambient temperature area.
Do not use the unit in an ambient
temperature less than 72℉ (22℃).
Check refrigerant level.
Fire alarm signal
Fire alarm signal is received
from Fire alarm system.
Reset unit by pushing and
holding the "OFF TIMER" button
for 5 seconds.
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