Johnson Controls HMH72B48 User Manual

Table 10: Outdoor unit fault codes
Fault code Fault description Possible reasons for fault Resolution Comments
47
Excessive discharge
temperature fault
1. Low refrigerant
charge.
2. Low charge due to
extended lineset.
3. Metering system
failure.
4. Excessive outdoor
ambient temperature.
1. Check for leaks.
2. Correct the
refrigerant charge.
3. Replace the metering
devices.
4. Normal protection.
48
Outdoor DC fan
motor fault (upper
fan motor)
1. The DC fan motor
connection is poor.
2. The wiring to the DC
fan motor has failed.
3. The DC fan motor has
failed.
4. The drive circuit of the
upper DC fan motor
has failed.
5. Outdoor airflow
blockage.
1. Replace the DC fan
motor wiring.
2. Replace the DC fan
motor.
3. Replace the DC fan
motor.
4. Replace the drive
board of the fan
motor.
5. Resolve the
outdoor unit airflow
restriction.
49
Outdoor DC fan
motor fault (lower
fan motor)
1. The DC fan motor
connection is poor.
2. The wiring to the DC
fan motor has failed.
3. The DC fan motor has
failed.
4. The drive circuit of the
lower DC fan motor
has failed.
5. Outdoor airflow
blockage.
1. Replace the DC fan
motor wiring.
2. Replace the DC fan
motor.
3. Replace the DC fan
motor.
4. Replace the drive
board of the fan
motor.
5. Resolve the
outdoor unit airflow
restriction.
Installation Manual: HMH7 Series - 17 SEER Horizontal Discharge Modulating Heat Pump 39
Johnson Controls Ducted Systems

Johnson Controls HMH72B48 Specifications

General

Brand	Johnson Controls
Model	HMH72B48
Category	Heat Pump
Language	English