Table 10: Outdoor unit fault codes
Fault code Fault description Possible reasons for fault Resolution Comments
91
Unit stops due to IPM
board overheating
fault
1. The outdoor ambient
temperature is too
high.
2. The speed of the
outdoor fan motor is
too low.
3. The outdoor unit
is not installed in
accordance with
the installation
instructions.
4. The supply power is
too low.
1. Normal protection.
2. Check the fan
motor and replace if
necessary.
3. Reinstall the outdoor
unit in accordance
with the installation
instructions.
4. Normal protection.
96 Low charge Inadequate system charge
Recover the refrigerant
and charge the refrigerant.
Refer to the Tabular Data
Sheet.
97 4-way valve failure
1. The connecting wiring
of the 4-way valve coil
is poor.
2. The 4-way valve coil
has failed.
3. The 4-way valve has
failed.
4. The drive board of the
4-way valve has failed.
1. Repair the wiring of
the 4-way valve.
2. Replace the 4-way
valve coil.
3. Replace the 4-way
valve.
4. Replace the drive
board of the 4-way
valve.
Note:
• If the indoor unit fails to start or the indoor unit stops after 30 s and the unit does not display the fault code,
check the voltage and connection to the control board.
• Verify indoor unit control operation and setup.
Table 11: Overload in cooling mode
No. Cause Resolution
1 The refrigerant is excessive.
Recover the refrigerant, and recharge the
refrigerant referring to the rating label.
2 The outdoor ambient temperature is too high. Use within allowable temperature range.
3
Short-circuit occurs in the air outlet and air inlet
of the outdoor unit.
Adjust the installation of the outdoor unit
referring to the installation instructions.
4 The outdoor heat exchanger is dirty. Clean the heat exchanger of the outdoor unit.
5 The speed of the outdoor fan motor is too low.
Check the outdoor fan motor operation and
replace if necessary.
6 The outdoor fan is damaged or blocked. Check the outdoor fan.
7 The air inlet and/or outlet has been blocked. Remove the obstructions.
8 The expansion valve or the capillary has failed. Replace the expansion valve or the capillary.
Installation Manual: HMH7 Series - 17 SEER Horizontal Discharge Modulating Heat Pump40
Johnson Controls Ducted Systems
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