SERVICING
74
PCBHR104
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
• Compressor and
outdoor fan are off
• Low pressure switch
trip 3 times within same
thermostat demand
• Thermostat demand is
present
• Integrated control
module diagnostic/
status LED display
shows the indicated
code
BLANK
L
1
• Low Pressure
Cut Out Lockout
(3 Trips)
• 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
• Must clear fault by
cycling 24VAC to
control
• Replace with correct
replacement part(s)
• Four consecutive
compressor protector
trips with average run
time between trips
greater than 1 minute
and less than 15
minutes
• Low pressure and high
pressure switches are
closed
• Integrated control
module diagnostic/
status LED display
shows the indicated
code
BLANK
0
2
• High Side Fault • Blocked
condenser coil
• Outdoor fan not
running
• Check and clean
the condenser coil
• Check outdoor
fan motor; repair/
replace as needed
• Check outdoor
fan motor wiring;
repair/replace as
needed
• Check outdoor
fan motor
capacitor; replace
as needed
• Turn power OFF prior
to repair
• Fault will clear after
4 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
2
• High Pressure
Cut Out Trip
• Blocked
condenser coil
• Outdoor fan not
running
• Check and clean
condenser coil
• Check outdoor
fan motor; repair/
replace as needed
• Check outdoor
fan motor wiring;
repair/replace as
needed
• Check outdoor
fan motor
capacitor; replace
as needed
• Turn power OFF prior
to repair
• Replace with correct
replacement part(s)
• Compressor and
outdoor fan are off
• Low pressure switch
trip 3 times within same
thermostat demand
• Thermostat demand is
present
• Integrated control
module diagnostic/
status LED display
shows the indicated
code
BLANK
L
2
• High Pressure
Cut Out Lockout
(3 Trips)
• Blocked
condenser coil
• Outdoor fan not
running
• Check and clean
condenser coil
• Check outdoor
fan motor; repair/
replace as needed
• Check outdoor
fan motor wiring;
repair/replace as
needed
• Check outdoor
fan motor
capacitor; replace
as needed
• Turn power OFF prior
to repair
• Must clear fault by
cycling 24VAC to
control
• Replace with correct
replacement part(s)
Содержание ASXC16
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