Installation Manual

15
TROUBLESHOOTING INFORMATION: UNITARY DIAGNOSTIC CODES
Digit 3 Digit 2 Digit 1
• Air conditioner/heat pump fails to
operate.
• Integrated control module
diagnostic/status LED display shows
the indicated code.
BLANK d 3
• Configuration Mis-
match
• Shared data sent to
integrated control
module does not
match hardware
configuration.
• Verify system type
(communicating or
legacy).
• Verify shared data
is correct for your
specific model; re-
populate data if
required.
• Wire system as
legacy system.
• Turn power OFF prior to
repair.
• Use memory card for
your specific model.
• Insert memory card
BEFORE turning power
ON. Memory card may be
removed after data is
loaded. Turn power OFF
before removing memory
card.
• Error code will be
cleared once data is
loaded.
• Air conditioner/heat pump fails to
operate.
• Integrated control module
diagnostic/status LED display shows
the indicated code.
BLANK d 4
• Invalid Memory
Card Data
• Shared data on
memory card has
been rejected.
• Verify system type
(communicating or
legacy).
• Verify shared data
is correct for your
specific model; re-
populate data if
required.
• Wire system as
legacy system.
• Turn power OFF prior to
repair.
• Use memory card for
your specific model.
• Insert memory card
BEFORE turning power
ON. Memory card may be
removed after data is
loaded. Turn power OFF
before removing memory
card.
• Error code will be
cleared once data is
loaded.
• Very long run time.
• Four consecutive compressor
protector trips with average run time
between trips greater than 3 hours.
• Compressor operating at high speed
and outdoor fan operating at low
speed
• Integrated control module
diagnostic/status LED display shows
the indicated code.
BLANK 0 1 • Low Side Fault
• Low refrigerant
charge.
• Restriction in liquid
line.
• Indoor blower motor
failure.
• Indoor thermostat
set extremely low.
• Verify refrigerant
charge; adjust as
needed.
• Check for restricted
liquid line; repair/
replace as needed.
• Check indoor
blower motor;
repair/replace as
needed.
• Check indoor
thermostat setting.
• Turn power OFF prior to
repair.
• Fault will clear after 3
consecutive normal
cycles.
• Fault may be cleared by
cycling 4V AC to control.
• Replace with correct
replacement part(s).
• Compressor and outdoor fan are off.
• Thermostat demand is present.
• Integrated control module
diagnostic/status LED display shows
the indicated code.
BLANK 0 1
• Low Pressure Cut
Out Trip
• Low refrigerant
charge.
• Restriction in liquid
line.
• Indoor blower motor
failure.
• Indoor thermostat set
extremely low.
• Verify refrigerant
charge; adjust as
needed.
•Check for restricted
liquid line; repair/
replace as needed.
• Check indoor blower
motor; repair/replace
as needed.
• Check low pressure
switch; repair/replace
as needed.
• Check indoor
thermostat setting.
• Turn power OFF prior to
repair.
• Replace with correct
replacement part(s).
UNITARY DIAGNOSTIC CODES
Symptoms of Abnormal
Operation
Diagnostic/Status
LED Displav Codes
Fault Description
Possible
Causes
Corrective Actions
Notes &
Cautions