5156631-UIM-G-0417
14
Johnson Controls Unitary Products
TABLE 8:
Fault Code Display
Description
LED
7-Segment
Display 1
7-Segment
Display 2
Control Fault Code
Control Failure
RED (solid)
0
0
Operational Fault Codes
High-pressure switch fault (not in lockout yet)
RED (solid)
0
1
System in high-pressure switch soft lockout (last mode of operation was normal compressor)
2 RED flashes
0
2
System in high-pressure switch hard lockout (last mode of operation was normal compressor)
3 RED flashes
0
2
System in high-pressure switch soft lockout (last mode of operation was defrost)
2 RED flashes
0
3
System in high-pressure switch hard lockout (last mode of operation was defrost)
3 RED flashes
0
3
Low-pressure switch soft lockout fault
2 RED flashes
0
4
Low-pressure switch hard lockout fault
3 RED flashes
0
4
Low Voltage (less than19.2 VAC) preventing further relay outputs for greater than 2 seconds
RED (solid)
0
6
Low Voltage (less than16 VAC) stopped current relay outputs for greater than 2 seconds
RED (solid)
0
7
Inverter Control Communications Fault
RED (solid)
0
8
Sensor or Switch Fault Codes
Outdoor (OD) ambient temperature sensor failure (short)
RED (solid)
0
9
OD ambient temperature sensor failure (open)
RED (solid)
1
0
Coil (liquid line) sensor failure (short)
RED (solid)
1
1
Coil (liquid line) sensor failure (open)
RED (solid)
1
2
Discharge sensor failure (short)
RED (solid)
1
3
Discharge sensor failure (open)
RED (solid)
1
4
High discharge line temperature
RED (solid)
1
5
Low discharge line temperature
RED (solid)
1
6
Wiring Related Fault Codes
“O” signal received in AC mode
RED (solid)
1
8
“W” signal received in AC mode
RED (solid)
1
9
“W” and “O” signal received in AC mode
RED (solid)
2
0
“W” and “O” signal received in HP mode
RED (solid)
2
4
Mismatch Speed Fault Codes
Compressor Start Failure
Red (solid)
2
5
OD Fan Start Failure
Red (solid)
2
6
Operating Envelope Threshold Errors
OD ambient temperature range of 109°
F – 125°
F (Cooling Mode)
RED (solid)
2
7
OD ambient temperature greater than 125°
F (Cooling Mode)
RED (solid)
2
8
OD ambient temperature less than 35°
F (Cooling Mode)
RED (solid)
2
9
Inverter Drive - Major Fault Codes
Compressor inverter / protective fault control (PFC) fault
RED (solid)
3
1
Fan inverter fault
RED (solid)
3
2
Loss of Communication with inverter interface control
RED (solid)
3
3
DC over voltage (software protection)
RED (solid)
3
4
DC under voltage (software protection)
RED (solid)
3
5
Compressor inverter over current (software protection)
RED (solid)
3
6
Intelligence power module (IPM) over temperature
RED (solid)
3
7
DC over voltage – IPM
RED (solid)
3
8
DC under voltage – IPM
RED (solid)
3
9
Compressor speed misalignment
RED (solid)
4
0
Phase lost detected by speed
RED (solid)
4
1
Phase lost detected by current
RED (solid)
4
2
Compressor IPM fault – By rising and falling edges of insulated-gate bipolar transistor (IGBT) voltage
RED (solid)
4
3
Inverter pulse width modulation (PWM) logic error
RED (solid)
4
4
Inverter PWM initialization error
RED (solid)
4
5
Compressor inverter shunt resistor unbalanced
RED (solid)
4
6
Fan inverter IPM fault
RED (solid)
4
7
Fan inverter misalignment and locked rotor
RED (solid)
4
8
Fan inverter phase lost
RED (solid)
4
9
