Instructions:
Testing Inverters
It is best to test inverters with no compressors connected especially if you expect the
compressor is at fault. But if you remove the wires from the compressor and try to run
the systems a fault will be displayed the fault is caused by the inverter PCB being able to
detect whether a compressor is connected or not. Most modern inverters are able to
detect whether the compressor has been disconnected in only a few seconds making
testing very difficult.
Testing can be done in two ways:
Firstly the hard way……
You will need a digital multi meter with a min max function,
Turn off the power
Disconnect the compressor either from the PCB or at the compressor terminals.
Connect your meter to two of the phases (Red to blue) set your meter to record max and
min voltage
Power up and Start the unit
Let the inverter start and watch the Voltage rise
Record the maximum Voltage
The inverter will stop after a few seconds and the voltage will fall to 0
Swap the leads to measure the next two phases (Red to Yellow).
Measure as before
Repeat for the last two phases Blue to Yellow.
The readings of maximum voltage should be the same for all 3 measurements if not the
inverter is faulty, the PCB will need replacing.
If the readings are equal the Inverter is healthy and the compressor will need replacing.
And the easy way:
You will need an LG Inverter tester,
Turn off the power
Disconnect the compressor lead from the compressor terminals.
Connect your inverter tester to all 3 leads (polarity is not important)
Power up and Start the unit
Let the inverter start and watch the leds
All 6 must light up and should be of equal brightness
The inverter will stop after a few seconds and the leds will go out
If you miss the leds (they will only light for a couple of seconds) the unit will try to start
again 3 times with a 3 minute delay between each test
If all 6 leds DON’T light up the inverter is faulty, the PCB will need replacing.
If the leds all light up the Inverter is healthy and the compressor will need replacing.
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