Johnson Controls HMH72B48 User Manual

Table 14: Drive fault code - 48k/60k
Fault code Fault description Possible reasons for fault Resolution
PFC overcurrent (single-phase
outdoor section)
1. System overload, current is
too large.
2. Drive board fault.
3. PFC fault.
1. Check the system.
2. Change the drive
board.
3. Change PFC.
14
Phase imbalance, phase loss, or
instantaneous power failure (only
for 3-phase power supply outdoor
sections)
1. 3-phase voltage imbalance.
2. 3-phase power supply phase
lost.
3. The power supply wiring is
incorrect.
4. Drive board fault.
1. Check the power
supply.
2. Check the power
supply.
3. Check the power
supply wiring
connection.
4. Change the drive
board.
15 Instantaneous power off detection
1. The power supply is not
stable.
2. Instantaneous power failure.
3. Drive board fault.
1. Check the power
supply.
2. No fault.
3. Change the drive
board.
16 Low DC voltage 200 V
1. The voltage input is too low.
2. Drive board fault.
1. Check the power
supply.
2. Change the drive
board.
18 Driver board read EE data error
1. EEPROM has no data or data
error.
2. EEPROM circuit fault.
1. Change the EEPROM
component.
2. Change the drive
board.
19 PFC chip receives data fault Abnormal communication loop. Change the drive board.
20 PFC soft start abnormally Abnormal PFC drive loop. Change the drive board.
21
Compressor drive chip could not
receive data from PFC chip
Communication loop fault. Change the drive board.
Installation Manual: HMH7 Series - 17 SEER Horizontal Discharge Modulating Heat Pump 45
Johnson Controls Ducted Systems

Johnson Controls HMH72B48 Specifications

General

Brand	Johnson Controls
Model	HMH72B48
Category	Heat Pump
Language	English