Johnson Controls HMH72B48 User Manual

Table 14: Drive fault code - 48k/60k
Fault code Fault description Possible reasons for fault Resolution
5 IPM FO output fault
1. System overload or current
overload.
2. Drive board fails.
3. Compressor oil shortage,
serious wear of crankshaft.
4. The compressor insulation
has failed.
1. Check the outdoor
section system.
2. Change the drive
board.
3. Change the
compressor.
4. Change the
compressor.
6
Communication between drive
board and control board fault
1. Communication wire
connection is poor.
2. Drive board fault.
3. Control board fault.
1. Check the wiring.
2. Change the drive
board.
3. Change the control
board.
7 AC voltage, overload voltage
1. The supply voltage input is
too high or too low.
2. Drive board fails.
1. Check the power
supply.
2. Change the drive
board.
8 DC voltage, overload voltage
1. The supply voltage input is
too high.
2. Drive board fault.
1. Check the power
supply.
2. Change the drive
board.
9 AC voltage imbalance Drive board fails. Change the drive board.
10
PFC current detection circuit fault
before compressor is ON
Bad drive board components. Change the drive board.
11 AC voltage supply out of range
1. Power supply abnormal,
power frequency out of
range.
2. Drive board fails.
1. Check the system.
2. Change the drive
board.
Products of single-phase PFC
overcurrent, FO output low level
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.
12
Inverter overcurrent (3-phase
power supply outdoor sections)
1. System overload, current is
too large.
2. Drive board fault.
3. Compressor oil shortage,
serious wear of crankshaft.
4. The compressor insulation
has failed.
1. Check the system.
2. Change the drive
board.
3. Change the
compressor.
4. Change the
compressor.
13 Inverter overcurrent
1. System overload, current is
too large.
2. Drive board fault.
3. Compressor oil shortage,
serious wear of crankshaft.
4. The compressor insulation
has failed.
1. Check the system.
2. Change the drive
board.
3. Change the
compressor.
4. Change the
compressor.
Installation Manual: HMH7 Series - 17 SEER Horizontal Discharge Modulating Heat Pump44
Johnson Controls Ducted Systems

Johnson Controls HMH72B48 Specifications

General

Brand	Johnson Controls
Model	HMH72B48
Category	Heat Pump
Language	English