SERVICING
76
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
and high pressure
switches are closed
• Open start circuit
has been detected 4
times with 5 minute
delay between each
detection
• Integrated control
module diagnostic/
status LED display
shows the indicated
code
BLANK
L
6
• Open Start
Circuit Lockout
• 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
• Must clear fault 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
7
• Open Run
Circuit
• Compressor run
winding is open
• Compressor not
properly wired to
control
• Faulty
compressor
wiring
• Check
compressor;
repair/replace as
needed
• Check wiring;
repair/replace as
needed
• Turn power OFF
prior to repair
• Fault will clear
after 1 normal cycel
• Fault may be
cycling 24VAC to
control
• Replace with
correct replacement
part(s)
• Compressor and
outdoor fan are off
• Low pressure
and high pressure
switches are closed
• Open run circuit
has been detected 4
times with 5 minute
delay between each
detection
• Integrated control
module diagnostic/
status LED display
shows the indicated
code
BLANK
L
7
• Open Run
Circuit Lockout
• Compressor run
winding is open
• Compressor not
properly wired to
control
• Faulty
compressor
wiring
• Check
compressor;
repair/replace as
needed
• Check wiring;
repair/replace as
needed
• Turn power OFF
prior to repair
• Must clear fault by
cycling 24VAC to
control
• Replace with
correct replacement
part(s)
• Air conditioner/heat
pump may appear to
be operating normally
• Compressor
protector may be
open (compressor
and outdoor fan off)
• Integrated control
module diagnostic/
status LED display
shows the indicated
code
BLANK
L
8
• Low Line
Voltage
• Low line voltage • Check circuit
breakers and
fuses
• Verify unit is
connected to
power supply
as specified on
rating plate
• Correct low
line voltage
condition;
contact local
utility if needed
• Turn power OFF
prior to repair
• Control detects
line voltage less
than 185 VAC
• Fault will clear
if line voltage
increases above
185 VAC
Содержание ASXC16
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