Johnson Controls HMH72B48 User Manual

Table 12: Overload in heating mode
No. Cause Resolution
1 The refrigerant is excessive.
Recover the refrigerant, and recharge
the refrigerant referring to the rating
label.
2 The indoor ambient temperature is too high.
Use within allowable temperature
range.
3
Short-circuit occurs in the air outlet and air inlet of the
indoor unit.
Adjust the installation of the indoor
unit referring to the installation
instructions.
4 The indoor filter is dirty. Clean the indoor filter.
5 The speed of the indoor fan motor is too low.
Check the indoor fan motor speed
setting.
6 The indoor fan is not operating correctly. Check the indoor fan.
7 The air inlet and/or outlet has been blocked. Remove the obstructions.
8 The expansion valve or the capillary fails.
Replace the expansion valve or the
capillary.
Table 13: Drive fault code - 24k/36k
Fault code Fault description Possible reasons for fault Resolution
1 Inverter DC voltage overload fault
2 Inverter DC low-voltage fault
3 Inverter AC current overload fault
1. The power supply input is
too high or too low.
2. Drive board fault.
1. Check the power
supply.
2. Change the drive
board.
4 Out-of-step detection
5
Loss phase detection fault (speed
pulsation)
6
Loss phase detection fault (current
imbalance)
1. Compressor phase lost.
2. Bad drive board
components.
3. Compressor insulation fault.
1. Check the compressor
wire connection.
2. Change the drive
board.
3. Change the
compressor.
7 Inverter IPM fault (edge)
8 Inverter IPM fault (level)
9 PFC_IPM IPM fault (edge)
10 PFC_IPM IPM fault (level)
1. System overload or current
overload.
2. Drive board fault.
3. Compressor oil shortage,
serious wear of crankshaft.
4. Compressor insulation fault.
1. Check the system.
2. Change the drive
board.
3. Change the
compressor.
4. Change the
compressor.
11 PFC power detection of failure
1. The power supply is not
stable.
2. Instantaneous power off.
3. Drive board failure.
1. Check the power
supply.
2. N/A
3. Change the drive
board.
12
PFC overload current detection of
failure
1. System overload, current is
too high.
2. Drive board fails.
3. PFC fails.
1. Check the system.
2. Change the drive
board.
3. Change the PFC.
Installation Manual: HMH7 Series - 17 SEER Horizontal Discharge Modulating Heat Pump 41
Johnson Controls Ducted Systems

Johnson Controls HMH72B48 Specifications

General

Brand	Johnson Controls
Model	HMH72B48
Category	Heat Pump
Language	English