LG RCWFH Series Instruction Manual page 127

Troubleshooting (2/3)
Abnormal category Displayed contents
Power transducer Power sensor error
Compressor dis-
Compressor dis-
charge temperature
charge temperature
Oil tank tempera- Oil tank tempera-
ture
Bearing tempera- Bearing tempera-
ture
Motor winding Motor winding
R(S,T) phase tem- R(S,T) phase tem-
perature perature high
Condenser
Condenser
pressure high
pressure
Motor Winding high Motor Winding high
temp. contact temp. active
Chilled water outlet Chilled water temp
temp
Evaporator Evaporator pressure
pressure
Oil differential Oil differential
pressure pressure low
Main power Main power
voltage voltage problem
Starter panel Starter panel abnor-
abnormal
Start-up failed Start-up failed
Chilled water pump Chilled water pump
Interlock Interlock Error
Cooling water pump Cooling water pump
Interlock Interlock Error
Sensor disconnected / short
circuit
Compressor discharge tem-
perature is detected to be
over set value
high
Oil tank temperature is de-
tected to be over set value
ture high
Bearing temperature is de-
tected to be over set value
ture high
Motor winding R(S,T) phase
temperature is detected to be
over set value.
Condenser pressure is de-
tected to be over set value
Motor winding high temp.
contact is active
Chilled water outlet temp. is
detected to be below set value.
low Error
There is no or small cooling
load
Evaporator pressure is de-
low tected to be below set value.
Oil differential pressure is de-
tected to be below set value.
Main power voltage is de-
tected to be below set value.
Starter panel abnormal, con-
tact is active
mal
During the start-up 2M mag-
net switch is not working
Pump interlock signal is dis-
connected during normal op-
eration. Pump stopped
Wrong wiring
IO board malfunction
Pump interlock signal is dis-
connected during normal op-
eration. Pump stopped.
Wrong wiring
IO board malfunction
Cause
Main board malfunction
Check parts status or wiring
Replace parts or re-wire
Check compressor discharge temperature dis-
played on the controller screen.
Check the set value and correct if it is wrong.
Check oil tank temperature displayed on the
controller screen.
Check the set value and correct if it is wrong.
Check bearing temperature displayed on the
controller screen.
Check the set value and correct if it is wrong.
Check motor coil R(S,T) phase temperature dis-
played on the controller screen.
Check the set value and correct if it is wrong.
Check condenser pressure displayed on the
controller screen.
Check the set value and correct if it is wrong
Check motor winding temp.
Check winding high temp. contact status and
wiring status
Check chilled water outlet temp. or temp. on
the thermometer.
Check the set value and correct if it is wrong
Check evaporator pressure displayed on the
controller screen.
Check the set value and correct if it is wrong
Check oil differential pressure displayed on the
controller screen.
Check the set value and correct if it is wrong
Check the voltage of main power and the volt-
age set value.
Check the status of the related parts and wiring
Replace parts or repair
Check the contact status of the starter panel
and remove the cause of the contact.
Check related parts status or wiring
Replace parts of malfunction or re-wire
Check 2M magnet operating status.
Check the status of the parts or wiring
Replace parts or re-wire
Check parts status or wiring
Replace parts or re-wire
Check parts status or wiring
Replace parts or re-wire
127
Action