SERVICING
77
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
• 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
H
8
• High Line
Voltage
• High line voltage • Correct high
line voltage
condition;
contact local
utility if needed
• Verify unit is
connected to
power supply
as specified on
rating plate
• Turn power OFF
prior to repair
• Control detects
line voltage greater
than 255 VAC
• Fault will clear
if line voltage
decreases below
255 VAC
• Air conditioner/heat
pump may appear to
be operating normally
• Integrated control
module diagnostic/
status LED display
shows the indicated
code
BLANK
0
9
• Low Pilot
Voltage
• Control detects
secondary
voltage less than
18 VAC
• Transformer
overloaded
• Low line voltage
• Check fuse
• Correct low
secondary
voltage condition
• Check
transformer;
replace if
needed
• Turn power OFF
prior to repair
• Fault will clear if
secondary voltage
rises above 21
VAC
• Replace
with correct
replacement
part(s)
• Compressor is off
• Integrated control
module diagnostic/
status LED display
shows the indicated
code
BLANK
P
0
• Comp
Protector Open
• No current
through run or
start windings
• Compressor run
winding is open
• Compressor not
properly wired to
control
• Faulty
compressor
wiring
• Failed
compressor run
capacitor
• Faulty run
capacitor wiring
• Check
compressor;
repair/replace as
needed
• Check wiring;
repair/replace as
needed
• Check run
capacitor;
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)
• 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
0
8
• No Line
Voltage
• No line voltage
• Check circuit
breaker and
fuses
• Verify unit is
connected to
power supply
as specified on
rating plate
• Turn power OFF
prior to repair
• Control detects
line voltage less
than 185VAC
• Fault will clear
if line voltage
increases above
185VAC
Содержание ASXC16
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