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FLASHING
12.7
C - Second Stage Cooling
Unit has received a command for second
13.X ICC Diagnostic Codes
13.X ICC Diagnostic Codes
13.X ICC Diagnostic Codes
13.X ICC Diagnostic Codes
stage cooling
13.X ICC Diagnostic Codes
Descriptions of the ICC diagnostic codes are provided below:
Descriptions of the ICC diagnostic codes are provided below:
C - Anti-short cycle timer (3 minutes) or
Descriptions of the ICC diagnostic codes are provided below:
Descriptions of the ICC diagnostic codes are provided below:
ICC Diagnostic Codes
Minimum run timer (30 seconds) active
Descriptions of the ICC diagnostic codes are provided below:
Descriptions of the ICC diagnostic codes are provided below:
7-Segment
7-Segment
Dual 7-Segment
7-Segment
7-Segment
LEDs Display
LEDs Display
LEDs Display
7-Segment
LEDs Display
LEDs Display
FLASHING
Code
Code
Code
LEDs Display
Code
Code
h1 - First Stage Heat Pump
0 – Standby
Code
0 – Standby
Unit has received a command for first stage
No command for unit operation
No command for unit operation
heat pump
h1 - Anti-short cycle timer (3 minutes) or
c - First Stage Cooling
c - First Stage Cooling
Minimum run timer (30 seconds) active
Unit has received a command for first stage
Unit has received a command for first stage
cooling
cooling
FLASHING
c - Anti-short cycle timer (3 minutes) or
c - Anti-short cycle timer (3 minutes) or
Minimum run timer (30 seconds) active
h2 - Second Stage Heat Pump
Minimum run timer (30 seconds) active
Unit has received a command for second
stage heat pump
FLASHING
FLASHING
FLASHING
FLASHING
h2 - Anti-short cycle timer (3 minutes) or
C - Second Stage Cooling
FLASHING
C - Second Stage Cooling
Minimum run timer (30 seconds) active
Unit has received a command for second
Unit has received a command for second
stage cooling
stage cooling
FLASHING
C - Anti-short cycle timer (3 minutes) or
C - Anti-short cycle timer (3 minutes) or
d1 – No Shared Data
Minimum run timer (30 seconds) active
d - Defrost Active
Minimum run timer (30 seconds) active
The unit is undergoing a defrost cycle
FLASHING
FLASHING
FLASHING
FLASHING
d3 – Airflow CFM Mismatch
t - Test Mode
h1 - First Stage Heat Pump
FLASHING
h1 - First Stage Heat Pump
The indoor air mover (air handler/furnace)
Unit has received a command for first stage
Unit has received a command for first stage
cannot supply the required airflow for
heat pump
heat pump
proper system operation
P – Protector Trip
h1 - Anti-short cycle timer (3 minutes) or
h1 - Anti-short cycle timer (3 minutes) or
A command for compressor operation is
Minimum run timer (30 seconds) active
Minimum run timer (30 seconds) active
present but no current is measured to the
compressor
01 – Long Run Time (Compressor)
FLASHING
FLASHING
FLASHING
FLASHING
The compressor has continuously run for
h2 - Second Stage Heat Pump
FLASHING
h2 - Second Stage Heat Pump
more than 18 hours in the cooling mode.
Unit has received a command for second
Unit has received a command for second
stage heat pump
stage heat pump
02 – High Pressure Control Open
h2 - Anti-short cycle timer (3 minutes) or
The ICC detects the HPC is open.
h2 - Anti-short cycle timer (3 minutes) or
Minimum run timer (30 seconds) active
Minimum run timer (30 seconds) active
FLASHING
FLASHING
FLASHING
03 – Short Cycling
FLASHING
d - Defrost Active
FLASHING
The ICC detects the run time for the past
d - Defrost Active
The unit is undergoing a defrost cycle
L
four (4) compressor cycles is less than three
The unit is undergoing a defrost cycle
(3) minutes each.
L4 – Locked Rotor
t - Test Mode
t - Test Mode
0 7
The ICC detects four (4) consecutive
protector trips have occurred and the
average run time for each trip is less than 15
seconds
05 – Open Circuit (Compressor will not
Run)
26
• The ICC has received a command for
unit operation but no current is present in
COMFORT CONTROL
CONVENTIONAL THERMOSTAT WIRING
Diagnostic Description
Diagnostic Description
Diagnostic Description
Diagnostic Description
Diagnostic Description
0 – Standby
0 – Standby
Diagnostic Description
0 – Standby
No command for unit operation
No command for unit operation
0 – Standby
No command for unit operation
No command for unit operation
c - First Stage Cooling
c - First Stage Cooling
c - First Stage Cooling
Unit has received a command for first stage
Unit has received a command for first stage
c - First Stage Cooling
Unit has received a command for first stage
cooling
cooling
Unit has received a command for first stage
cooling
cooling
c - Anti-short cycle timer (3 minutes) or
c - Anti-short cycle timer (3 minutes) or
Minimum run timer (30 seconds) active
c - Anti-short cycle timer (3 minutes) or
Minimum run timer (30 seconds) active
c - Anti-short cycle timer (3 minutes) or
Minimum run timer (30 seconds) active
Minimum run timer (30 seconds) active
C - Second Stage Cooling
C - Second Stage Cooling
Unit has received a command for second
C - Second Stage Cooling
stage cooling
Unit has received a command for second
C - Second Stage Cooling
Unit has received a command for second
stage cooling
Unit has received a command for second
stage cooling
C - Anti-short cycle timer (3 minutes) or
stage cooling
d1 – No Shared Data
Minimum run timer (30 seconds) active
C - Anti-short cycle timer (3 minutes) or
C - Anti-short cycle timer (3 minutes) or
d1 – No Shared Data
d1 – No Shared Data
Minimum run timer (30 seconds) active
C - Anti-short cycle timer (3 minutes) or
Minimum run timer (30 seconds) active
Minimum run timer (30 seconds) active
d3 – Airflow CFM Mismatch
t - Test Mode
d3 – Airflow CFM Mismatch
d3 – Airflow CFM Mismatch
The indoor air mover (air handler/furnace)
h1 - First Stage Heat Pump
The indoor air mover (air handler/furnace)
The indoor air mover (air handler/furnace)
h1 - First Stage Heat Pump
cannot supply the required airflow for
Unit has received a command for first stage
cannot supply the required airflow for
h1 - First Stage Heat Pump
cannot supply the required airflow for
Unit has received a command for first stage
proper system operation
heat pump
proper system operation
proper system operation
Unit has received a command for first stage
heat pump
P – Protector Trip
P – Protector Trip
P – Protector Trip
heat pump
A command for compressor operation is
P – Protector Trip
A command for compressor operation is
h1 - Anti-short cycle timer (3 minutes) or
present but no current is measured to the
A command for compressor operation is
h1 - Anti-short cycle timer (3 minutes) or
A command for compressor operation is
present but no current is measured to the
Minimum run timer (30 seconds) active
compressor
present but no current is measured to the
h1 - Anti-short cycle timer (3 minutes) or
Minimum run timer (30 seconds) active
present but no current is measured to the
compressor
compressor
Minimum run timer (30 seconds) active
01 – Long Run Time (Compressor)
compressor
01 – Long Run Time (Compressor)
The compressor has continuously run for
01 – Long Run Time (Compressor)
01 – Long Run Time (Compressor)
The compressor has continuously run for
more than 18 hours in the cooling mode.
The compressor has continuously run for
The compressor has continuously run for
more than 18 hours in the cooling mode.
h2 - Second Stage Heat Pump
more than 18 hours in the cooling mode.
more than 18 hours in the cooling mode.
h2 - Second Stage Heat Pump
Unit has received a command for second
02 – High Side Fault
h2 - Second Stage Heat Pump
Unit has received a command for second
02 – High Pressure Control Open
Compressor limit has opened four (4) times
stage heat pump
Unit has received a command for second
stage heat pump
02 – High Pressure Control Open
02 – High Pressure Control Open
The ICC detects the HPC is open.
within a call for operation
stage heat pump
The ICC detects the HPC is open.
The ICC detects the HPC is open.
h2 - Anti-short cycle timer (3 minutes) or
h2 - Anti-short cycle timer (3 minutes) or
Minimum run timer (30 seconds) active
h2 - Anti-short cycle timer (3 minutes) or
Minimum run timer (30 seconds) active
Minimum run timer (30 seconds) active
03 – Short Cycling
03 – Short Cycling
The ICC detects the run time for the past
03 – Short Cycling
03 – Short Cycling
The ICC detects the run time for the past
four (4) compressor cycles is less than three
The ICC detects the run time for the past
The ICC detects the run time for the past
four (4) compressor cycles is less than three
(3) minutes each.
d - Defrost Active
d - Defrost Active
four (4) compressor cycles is less than three
four (4) compressor cycles is less than three
(3) minutes each.
The unit is undergoing a defrost cycle
d - Defrost Active
The unit is undergoing a defrost cycle
L4 – Locked Rotor
(3) minutes each.
(3) minutes each.
L4 – Locked Rotor
The unit is undergoing a defrost cycle
The ICC detects four (4) consecutive
L4 – Locked Rotor
L4 – Locked Rotor
The ICC detects four (4) consecutive
protector trips have occurred and the run time
The ICC detects four (4) consecutive
t - Test Mode
before each trip is less than 15 seconds
The ICC detects four (4) consecutive
protector trips have occurred and the
t - Test Mode
protector trips have occurred and the
protector trips have occurred and the
average run time for each trip is less than 15
t - Test Mode
average run time for each trip is less than 15
average run time for each trip is less than 15
seconds
seconds
seconds
05 – Open Circuit (Compressor will not
05 – Open Circuit (Compressor will not
05 – Open Circuit (Compressor will not
Run)
Run)
Run)
• The ICC has received a command for
• The ICC has received a command for
• The ICC has received a command for
unit operation but no current is present in
unit operation but no current is present in
unit operation but no current is present in
the start and run circuits.
cooling during an active anti-short cycle timer
or minimum run timer.
• Wait until unit timer has expired or press the
TEST button to reset timer.
Normal operation
2
SYSTEM™ CONTROL WIRING
AND
ICC DIAGNOSTIC CODES
• The unit has received a command for second
stage cooling during an active anti-short cycle
timer or minimum run timer.
Status/Possible Cause – Troubleshooting
• Wait unit timer has expired or press the TEST
Status/Possible Cause – Troubleshooting
Status/Possible Cause – Troubleshooting
Status/Possible Cause – Troubleshooting
Status/Possible Cause – Troubleshooting
button to reset timer.
Status/Possible Cause – Troubleshooting
Normal operation
Normal operation
Normal operation
Normal operation
Normal operation
Normal operation
Normal operation
• The unit has received a command for first stage
Normal operation
Normal operation
Normal operation
Normal operation
Normal operation
heat pump during an active anti-short cycle
Normal operation
timer or minimum run timer.
• Wait unit timer has expired or press the TEST
• The unit has received a command for first stage
button to reset timer.
• The unit has received a command for first stage
• The unit has received a command for first stage
cooling during an active anti-short cycle timer
• The unit has received a command for first stage
• The unit has received a command for first stage
Normal operation
cooling during an active anti-short cycle timer
cooling during an active anti-short cycle timer
or minimum run timer.
• The unit has received a command for first stage
cooling during an active anti-short cycle timer
cooling during an active anti-short cycle timer
• Wait until unit timer has expired or press the
or minimum run timer.
or minimum run timer.
or minimum run timer.
cooling during an active anti-short cycle timer
or minimum run timer.
TEST button to defeat short cycle delay.
• Wait until unit timer has expired or press the
• Wait until unit timer has expired or press the
or minimum run timer.
• Wait until unit timer has expired or press the
• Wait until unit timer has expired or press the
TEST button to reset timer.
TEST button to reset timer.
Normal operation
• Wait until unit timer has expired or press the
TEST button to reset timer.
TEST button to reset timer.
• The unit has received a command for second
Normal operation
Normal operation
TEST button to reset timer.
Normal operation
Normal operation
stage heat pump during an active anti-short
Normal operation
cycle timer or minimum run timer.
• Wait unit timer has expired or press the TEST
• The unit has received a command for second
ELECTRONICS GROUP TO
stage cooling during an active anti-short cycle
button to reset timer.
• The unit has received a command for second
• The unit has received a command for second
• The unit has received a command for second
ELECTRONICS GROUP TO
• The unit has received a command for second
ELECTRONICS GROUP TO
timer or minimum run timer.
ELECTRONICS GROUP TO
Normal operation
stage cooling during an active anti-short cycle
stage cooling during an active anti-short cycle
• The unit has received a command for second
stage cooling during an active anti-short cycle
stage cooling during an active anti-short cycle
• Wait unit timer has expired or press the TEST
timer or minimum run timer.
timer or minimum run timer.
button to defeat short cycle delay.
stage cooling during an active anti-short cycle
timer or minimum run timer.
timer or minimum run timer.
• Wait unit timer has expired or press the TEST
• Wait unit timer has expired or press the TEST
timer or minimum run timer.
• Wait unit timer has expired or press the TEST
• Wait unit timer has expired or press the TEST
• Misapplied/wrong indoor air mover – replace
The ICC is in TEST mode
button to reset timer.
button to reset timer.
• Misapplied/wrong indoor air mover – replace
• Wait unit timer has expired or press the TEST
button to reset timer.
button to reset timer.
• Misapplied/wrong indoor air mover – replace
with properly sized air handler/furnace.
• Misapplied/wrong indoor air mover – replace
The ICC is in TEST mode
Normal operation
Normal operation
with properly sized air handler/furnace.
button to reset timer.
Normal operation
Normal operation
with properly sized air handler/furnace.
with properly sized air handler/furnace.
Normal operation
• Motor protector open
• Motor protector open
• Motor protector open
• Motor protector open
• Line voltage disconnected
• Line voltage disconnected
• Motor protector open
• The unit has received a command for first stage
• The unit has received a command for first stage
• The unit has received a command for first stage
• Line voltage disconnected
• The unit has received a command for first stage
• Line voltage disconnected
• Line voltage disconnected
heat pump during an active anti-short cycle
heat pump during an active anti-short cycle
• The unit has received a command for first stage
heat pump during an active anti-short cycle
heat pump during an active anti-short cycle
timer or minimum run timer.
timer or minimum run timer.
heat pump during an active anti-short cycle
• Low refrigerant charge
timer or minimum run timer.
timer or minimum run timer.
• Low refrigerant charge
• Wait unit timer has expired or press the TEST
• Wait unit timer has expired or press the TEST
• Air ducts have substantial leakage
timer or minimum run timer.
• Low refrigerant charge
• Wait unit timer has expired or press the TEST
• Wait unit timer has expired or press the TEST
• Low refrigerant charge
• Air ducts have substantial leakage
• Low refrigerant charge
• Dirty indoor air filter
button to reset timer.
button to reset timer.
• Wait unit timer has expired or press the TEST
button to reset timer.
• Air ducts have substantial leakage
button to reset timer.
• Air ducts have substantial leakage
• Dirty indoor air filter
• Dirty outdoor coil
• Air ducts have substantial leakage
Normal operation
Normal operation
button to reset timer.
Normal operation
• Dirty indoor air filter
Normal operation
• Dirty indoor air filter
• Dirty outdoor coil
• Dirty indoor air filter
• Outdoor coil is dirty (cooling mode)
Normal operation
• Dirty outdoor coil
• Dirty outdoor coil
Reference ICC codes:
• Dirty outdoor coil
• Outdoor fan is not running (cooling mode)
Reference ICC codes:
Reference ICC codes:
• 21
• Dirty indoor coil or filter (heating mode)
Reference ICC codes:
• 21
• Indoor blower is not running (heating mode)
• 21
• L21
• The unit has received a command for second
• The unit has received a command for second
• 21
• The unit has received a command for second
• The unit has received a command for second
• Liquid line restriction
• L21
• L21
• 29
stage heat pump during an active anti-short
stage heat pump during an active anti-short
• L21
• Excessive refrigerant charge
• The unit has received a command for second
stage heat pump during an active anti-short
stage heat pump during an active anti-short
• 29
• 29
• L29
cycle timer or minimum run timer.
cycle timer or minimum run timer.
• 29
stage heat pump during an active anti-short
cycle timer or minimum run timer.
cycle timer or minimum run timer.
• Check thermostat wire connections (R, C, 1, &
• L29
• L29
• Wait unit timer has expired or press the TEST
• Wait unit timer has expired or press the TEST
• Check thermostat wire connections (R, C, 1, &
• L29
cycle timer or minimum run timer.
• Wait unit timer has expired or press the TEST
• Wait unit timer has expired or press the TEST
2)
• Check thermostat wire connections (R, C, 1, &
• Check thermostat wire connections (R, C, 1, &
button to reset timer.
2)
button to reset timer.
• Check thermostat location in zone (too close to
• Check thermostat wire connections (R, C, 1, &
• Wait unit timer has expired or press the TEST
button to reset timer.
button to reset timer.
2)
2)
discharge grill)
Normal operation
• Check thermostat location in zone (too close to
Normal operation
2)
button to reset timer.
Normal operation
Normal operation
• Check thermostat location in zone (too close to
• Check thermostat location in zone (too close to
discharge grill)
• Check thermostat location in zone (too close to
Normal operation
• Bad run capacitor
discharge grill)
discharge grill)
• Bad run capacitor
discharge grill)
• Low line voltage
• Bad run capacitor
• Bad run capacitor
• Low line voltage
• Excessive refrigerant in compressor
• Bad run capacitor
The ICC is in TEST mode
The ICC is in TEST mode
• Low line voltage
• Low line voltage
The ICC is in TEST mode
• Excessive refrigerant in compressor
• Seized bearings in compressor
The ICC is in TEST mode
• Low line voltage
• Excessive refrigerant in compressor
The ICC is in TEST mode
• Excessive refrigerant in compressor
• Seized bearings in compressor
• Excessive refrigerant in compressor
• Seized bearings in compressor
• Seized bearings in compressor
• Seized bearings in compressor
• Check for damaged, miswired, or wrong run
• Check for damaged, miswired, or wrong run
• Check for damaged, miswired, or wrong run
capacitor
• Check for damaged, miswired, or wrong run
capacitor
capacitor
• Check for broken wires, loose connectors, or
capacitor
• Check for broken wires, loose connectors, or
• Check for broken wires, loose connectors, or
miswired compressor
• Check for broken wires, loose connectors, or
miswired compressor
miswired compressor
• Check compressor windings for continuity
miswired compressor
Information
Information
Information
Information
Information
Information
DESCRIBE
DESCRIBE
DESCRIBE
DESCRIBE
10
10
10
10
10
10
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