Phase Detection; Pressure Switch - LG ARUV Series Service Manual

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.

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.
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Function
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