Troubleshooting - LG ARNH963K2A2 Installation Manual

Table 27: Hydro Kit Error Code Troubleshooting (Continued)
Error Code Hydro Kit
Model
18 (K2, K3)
*Enabled for
Emergency
Operation
K3
21
K3
22
K3
23
K3
25
K3
26
K3
27
K3
28
K3
29
K3
32
K3
34
K3
35
K3
36
K3
40
K3
41
K3
42
Error Type
Water outlet temperature sensor error
Inverter compressor IPM defect
Inverter compressor overcurrent
Inverter compressor DC Link low voltage
High/low Inverter input voltage
Inverter compressor activation failure
Inverter PSC/PFC Fault Error
Inverter DC Link high voltage error
Inverter compressor overcurrent
Excessive rise of inverter compressor discharge
temperature
Excessive rise of high pressure of inverter
compressor
Excessive drop of low pressure of inverter
compressor
Low pressure ratio error of inverter compressor
Inverter compressor CT sensor defect
Inverter compressor discharge pipe temperature
sensor defect
Low pressure sensor defect of inverter compressor
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troublesHootING

Cause
The Hydro Kit refrigerant to water heat
exchanger's waterside outlet temperature sensor
malfunctioned. Sensor and/or cable may be
disconnected or shorted.
R134a circuit compressor and/or inverter board
has malfunctioned.
R134a compressor current transformer sensed
excessive current draw.
Insufficient power sensed in the DC charging
circuit to operate compressor. Obtain an inverter
board testing instrument and verify DC charging
circuit is operating correctly.
R134a circuit inverter sensed the input voltage
was out of tolerance (+/- 10%) for a minimum
period of 4 seconds.
R134a circuit inverter compressor failed to start.
R134a circuit inverter board detected excessive
current draw.
Excessive power sensed in the DC charging
circuit. Triggered by an unexpected stop of the
compressor. Check inverter compressor for
malfunction. Use an inverter checker to verify the
inverter board is operating properly.
R134a circuit compressor locked out due to
compressor current transformer sensing a high
current draw condition.
R134a circuit compressor shut down due to high
discharge gas temperature.
R134a circuit compressor shut down due to high
discharge pressure.
R134a compressor shut down due to low suction
pressure.
R134a compressor high/low side differential
pressure ratio dropped below 1.8 for a minimum of
three minutes.
R134a compressor current transformer failure.
R134a compressor discharge temperature sensor
has failed and/or cable is loose, disconnected or
shorted.
R134a compressor suction pressure sensor has
failed and/or cable is loose, disconnected or
shorted.
Error Codes
77