Johnson Controls DHPM09NWM42Q1 Installation Manual page 27

TABLE 12: Error Codes
Indoor Character
Indoor coil sensor (RT2)
F2
open or short circuited
Outdoor ambient sensor (RT4)
F3
open or short circuit
Outdoor coil sensor (RT3)
F4
open or short circuit
F5 Discharge line sensor (RT5) error
F6 Compressor overload limit issue
F8 High current limit issue
F9 Discharge line temperature too high
HC Power factor correction protection
Compressor demagnetization
HE
protection
Heating mode anti-high
H0
temperature protection
H1 Defrosting (heat pump only)
H2 Electrostatic protection
Compressor overload protection
H3
sensor (CT1,2) malfunction.
Compressor high
H4
temperature protection
Intelligent Power Module
H5
(IPM) module protection
Johnson Controls Unitary Products
Display
Cooling and dehumidification modes will
continue to operate as well as indoor fan.
Unit will not operate in heating mode.
All system functions are terminated except
indoor fan.
All system functions will continue to run for
3 minutes, then terminate. Indoor fan will
continue to run.
Normal operational state with compressor
speed automatically adjust for operational
conditions. System will continue to opera-
tion at reduced compressor speed until
issue is corrected.
System will continue to operate at reduce
compressor speed until issue is corrected.
Check discharge line temperature. Correct
if to high.
Refer to the ProficienTECH Ductless Splits
Technical Training Manual.
Compressor has exceeded peak demag-
netization current (41A), reduced fre-
quency. Compressor running at reduced
frequency.
Normal operation
System protection feature. All system
functions are terminated except indoor fan.
All system functions are terminated except
indoor fan.
All system functions are terminated except
indoor fan.
All system functions are terminated except
indoor fan.
System Status
898150-UIM-B-0113
Troubleshooting for
Possible Causes
• Check sensor to ensure that it is in
acceptable range.
• Check sensor for proper resistance.
• Replace sensor if shorted, open or out-
of-calibration.
• Check outdoor ambient air temperature.
Could be too high.
• Check for locked compressor rotor.
• Check for blocked refrigeration circuit
(capillary tubes for example).
• Check for blocked or restricted outdoor
air flow. Clear, if necessary.
• Check for low refrigerant charge.
Check for low or high input voltage. Cor-
rect if necessary. Could be too high.
De-energize system and restart.
Refer to the ProficienTECH Ductless Splits
Technical Training Manual.
Normal defrost operation.
Excessive electrostatic charge present.
Correct, if possible.
• Check for proper wiring connections and
loose wires at outdoor control (CT1, 2) in-
put plug.
• Check for continuity across overload pro-
tection sensor terminals mounted at top of
compressor.
• Check for proper wiring connections and
loose wires at outdoor control (CT1, 2) in-
put plug.
• Check for continuity across overload pro-
tection sensor terminals mounted at top of
compressor.
This can be caused by any of the follow-
ing:
• Loss of cooling to the heat sink
• Low voltage.
• High ambient temperature
• Loose screws fastening the outdoor con-
trol to the heat sink
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