SERVICING
75
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
• Run time for last 4
cycles is less than 3
minutes each.
• Compressor protector
has not tripped. Low
pressure and high
pressure switches are
closed.
• Integrated control
module diagnostic/
status LED display
shows the indicated
code.
BLANK
0
3
• Short Cycling
• Intermittent
thermostat demand
• Faulty compressor
relay
• Check thermostat
and thermostat
wiring; repair/
replace as needed
• Check
compressor relay
operation; replace
control 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)
• Minimum
compressor run time
is changed from 30
seconds to 3 minutes
• Compressor and
outdoor fan are off
• Compressor protector
trips four consecutive
times
• Average run time
between trips is less
than 15 seconds
• Integrated control
module diagnostic/
status LED display
shows the indicated
code
BLANK
0
4
• Locked Rotor
• Compressor
bearings are seized
• Failed compressor
run capacitor
• Faulty run
capacitor wiring
• Low line voltage
• Check
compressor
operation; repair/
replace as needed
• Check run
capacitor; replace
as needed
• Check wiring;
repair/replace as
needed
• Verify line voltage
is within range on
rating plate; control
local utility is out of
range
• Turn power OFF
prior to repair
• Must clear fault by
cycling 24VAC to
control
• Replace with correct
replacement part(s)
• Compressor and
outdoor fan are off for
greater than 4 hours
• Low pressure and high
pressure switches are
closed
• Integrated control
module diagnostic/
status LED display
shows the indicated
code
BLANK
0
5
• Open Circuit
• Power is
disconnected
• Failed compressor
protector
• Compressor not
properly wired to
control
• Check circuit
breakers and fuses
• Check wiring to
unit; repair/replace
as needed
• Check
compressor;
repair/replace as
needed
• Check
compressor wiring;
repair/replace as
needed
• Turn power OFF
prior to repair
• Fault will clear after
1 normal cycle
• Fault may be cleared
by cycling 24VAC to
control
• Replace with correct
replacement part(s)
• Compressor and
outdoor fan are off
• Low pressure and high
pressure switches are
closed
• Integrated control
module diagnostic/
status LED display
shows the indicated
code
BLANK
0
6
• Open Start
Circuit
• Compressor start
winding is open
• Failed compressor
run capacitor
• Faulty run
capacitor wiring
• Compressor not
properly wired to
control
• Faulty compressor
wiring
• Check
compressor;
repair/replace as
needed
• Check run
capacitor; replace
as needed
• Check wiring;
repair/replace as
needed
• Turn power OFF
prior to repair
• Fault will clear after
1 normal cycle
• Fault may be cleared
by cycling 24VAC to
control
• Replace will correct
replacement part(s)
Summary of Contents for ASXC16
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