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Only for training and service purposes
LGE Internal Use Only
Function
3.6 Pressure switch
■ Sub unit
- Sub PCB has pressure sensing switch in series between compressor and power relay.
- The state of pressure sensing switch is normally on. It has small electric current from 220V AC. Never touch
the connecting terminal with hand nor short two wires directly.
3.5 Phase detection
■ Main unit
- Inverter PCB has phase fault detection circuit. If a phase is missed or phases are reversed, error LED(red)
flickers once per second when power is on.
■ Sub unit
- Sub PCB has phase fault detection circuit. If a phase is missed or phases are reversed, phase fault error
occurs and LED 6 is on.
❇ Phase fault detection is enable only for 5 sec after power is on.
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