14
920-075-09
Error
Code Code Translation
Action Taken by Unit
Possible Cause
0 2
An extreme low voltage condition
exists <198V for 230V units and
<239V for 265V units.
Shut down unit. Display Error code and
flash. Once voltage rises to normal level
system power is restored.
• Inadequate power supply
• Defective breaker
• Blown fuse
0 3
Return air thermistor sensor open or
short circuit
Set return air sensor = 75°F. Alternately flash
set point and error code. Leave unit running.
• Defective sensor
0 4
Indoor coil thermistor sensor open
or short circuit
Set ID coil temp = 40°F. Alternately flash set
point and error code. Leave unit running.
• Defective sensor
0 5
Outdoor coil thermistor sensor open
Or short circuit
Set OD coil temp = 20°F. Alternately flash
set point and error code. Automatically
change over to Electric heat Mode only.
Leave unit running.
• Defective sensor
0 6
If O.D. coil Temperature > 175 Deg
F for 2 consecutive minutes. (Heat
Pump models only)
Alternately flash set point and error code.
Shut unit down for 5 minutes, then try again
2 times. If it fails the 3rd time, shut down unit
to prevent high head pressure.
• Dirty coil
• Fan motor failure
• Restricted air flow
• Non-condensables in
refrigeration system
0 7
I.D coil temperature <30 Deg F for 2
consecutive minutes.
Alternately flash set point and error code.
Continue fan operation while the compressor
is locked out until the indoor coil thermistor
reaches 45° F, then energize the compres
-
sor. However, compressor must still wait a
lockout time of 180 to 240 seconds.
• Dirty filters
• Dirty coil
• Fan motor failure
• Restricted airflow
• Improper refrigerant charge
• Restriction in refrigerant circuit
0 8
Unit cycles (Heat or Cool demand)
> 9 times per hour
Store error code in memory.
Keep unit running
• Unit oversized
• Low load conditions
0 9
Unit cycles (Heat or Cool demand)
< 3 times per hour
Store Error Code in memory.
Keep unit running
• Unit undersized
• High load conditions
1 0
Room Freeze Protection triggered
Alternately flash set point and error code.
Keep unit running.
• Room temperature fell below
40°F
1 1
No Signal to “GL or “GH” terminal
(Remote Thermostat mode only)
Shut down unit. Display error code and flash.
• Defective remote thermostat
• Defective thermostat wiring
1 3
If Pressure limit switch opens
Turn OFF compressor. Alternate flash set
point and error code
Factory Dip Switch Configuration
1 2 3 4 5 6 7 8
O
N
Error Codes
The chart below lists the possible error codes and their description:
