SERVICING
80
PCBHR105
UNITARY DIAGNOSTIC CODES
Symptoms
of Abnormal
Operation
Diagnostic/Status LED
Display Codes
Fault
Description
Possible Causes
Corrective
Actions
Notes & Cautions
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
Mismatch
• 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; repopulate
data if required
• Wire system as
legacy system
• Turn power OFF prior to
repair
• Use Bluetooth
®
Shared
Data Loader BTSDL01 for
your specific model
• Insert Bluetooth
®
Shared Data Loader
BTSDL01 BEFORE
turning power ON.
Bluetooth
®
Shared Data
Loader BTSDL01 may
be removed after data
is loaded. Turn power
OFF before removing
Bluetooth
®
Shared Data
Loader BTSDL01
• Air conditioner/heat
pump fails to operate
• Integrated control
module diagnostic/
status LED display
shows the indicated
code
BLANK
d
4
• Invalid Shared
Data
• Shared data on
Bluetooth
®
Shared
Data Loader
BTSDL01 has been
rejected
• Verify
system type
(communicating or
legacy)
• Verify shared
data is correct
for your specific
model; repopulate
data if required
• Wire system as
legacy system
• Turn power OFF prior to
repair
• Use Bluetooth
®
Shared
Data Loader BTSDL01 for
your specific model
• Insert Bluetooth
®
Shared Data Loader
BTSDL01 BEFORE
turning power ON.
Bluetooth
®
Shared Data
Loader BTSDL01 may
be removed after data
is loaded. Turn power
OFF before removing
Bluetooth
®
Shared Data
Loader BTSDL01
• 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 spped 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 30
consecutive normal cycles
• Fault may be cleared by
cycling 24VAC 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)
Summary of Contents for ASXC16
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