Table 10: Outdoor unit fault codes
Fault code Fault description Possible reasons for fault Resolution Comments
18
AC voltage is
abnormal
1. The AC voltage is >275
V or <160 V.
2. The AC voltage of
the sampling circuit
on the drive board is
abnormal.
1. Normal protection,
check the supply
power.
2. Replace the drive
board.
19
Suction temperature
sensor fault
1. The wiring of the
suction temperature
sensor has a poor
connection.
2. The suction
temperature sensor
has failed.
3. Sensor circuit failure.
1. Reconnect the
suction pressure
sensor wiring.
2. Replace the suction
pressure sensor.
3. Replace the outdoor
control board.
22
Defrosting sensor
fault
1. The wiring of the
defrost temperature
sensor has a poor
connection.
2. The defrost
temperature sensor
has failed.
3. Sensor circuit failure.
1. Reconnect the wiring
of the defrost sensor.
2. Replace the defrost
sensor.
3. Replace the outdoor
control board.
43
High-pressure sensor
fault
1. The wiring of the high-
pressure sensor has a
poor connection.
2. The high-pressure
sensor has failed.
3. The high-pressure
pressure sensor circuit
has failed.
1. Reconnect the high-
pressure sensor
wiring.
2. Replace the high-
pressure sensor.
3. Replace the outdoor
control board.
45 IPM fault Drive or amplifier fault
See Table 13 and Table 14
for drive fault codes.
46
IPM and
control board
communication fault
1. The cable between the
control board and the
drive board has a poor
connection.
2. The cable between the
control board and the
drive board has failed.
3. The drive board has
failed.
4. The control board has
failed.
1. Reconnect the cable
between the control
board and the drive
board.
2. Replace the
communication cable
between the control
board and the drive
board.
3. Replace the drive
board.
4. Replace the control
board.
Installation Manual: HMH7 Series - 17 SEER Horizontal Discharge Modulating Heat Pump38
Johnson Controls Ducted Systems
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