16
Self-Diagnostic Codes
When a self-diagnostic code is displayed on the LCD, the unit stops operation, relay contact RL07
for terminal OS-1 and OS2 is closed.
CODE
CONDITION
POSSIBLE CAUSE
SOLUTION
AL1
Alarm device 1 is
activated
Alarm device connected to
FA-1 and FA-2 of terminal
block 1 is activated
1. Check FA-1, FA-2 connection
2. Identify and correct condition causing
alarm
3. Press CLEAR button to reset
AL2
Alarm device 2 is
activated
Alarm device connected to
AL-1 and AL-2 of terminal
block 1 is activated
1. Check AL-1, AL-2 connection
2. Identify and correct condition causing
alarm
3. Press CLEAR button to reset
FL
Drain tank is full
Drain tank is full of water
1. Empty tank
2. Place tank back in unit
3. Press CLEAR button to reset
Loose drain switch connection
1. Reconnect switch
2. Press CLEAR button to reset
Defective drain switch
1. Replace switch
2. Press CLEAR button to reset
PU
Condensate pump safety
switch is activated
Condensate pump stops due
to kinks and/or blockage or
improper routing of drain line
1. Remove blockage or kinks from drain
line, or re-route drain line
2. Press CLEAR button to reset
Missing or loose jumper
connector
1. If the jumper connector is missing,
insert one
If connector is loose, reconnect it
2. Press CLEAR button to reset
Defective condensate pump
1. Replace pump
2. Press CLEAR button to reset
CF
Cooling function failure
occurs 3 times and
following condition
continues for 15 minutes
RTS - CTS
1
< 9 °F (5 °C)
Insufficient refrigerant or
refrigerant leak
Repair leak and add refrigerant based
on the weight listed on specifications or
nameplatet
Defective compressor
1. Replace compressor
2. Press CLEAR button to reset
E1
RTS thermistor failure
Loose RTS thermistor
connection
Reconnect thermistor
Defective RTS thermistor
(short or open circuit)
Replace thermistor
E3
CTS1 thermistor failure
Loose CTS1 thermistor
connection
Reconnect thermistor
Defective CTS1 thermistor
(short or open circuit)
Replace thermistor
