ERS EMCH-10W/1, Installation And User Manual

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3) L2 troubleshooting
Step 1: Check the DC voltage between terminal 1 and 2, the normal value should be 510V~580V, if the voltage is
higher than 580V, go to step 2.
If the value is not in the range, this indicates a problem with the electrolytic capacitor power supply, check the
power supply for high or unstable voltage.
If the voltage value is normal, then the main PCB has malfunctioned, it needs to be replaced.
4) L8/L9 troubleshooting
Step 1: Compressor check
Measure the resistance between each two of U, V, W terminals of the compressor, all the resistance should be
the same and equal to 0.9~5 Ohms. (Fig. A and Fig. B)
Measure the resistance between each U, V, W terminal of the compressor and ground (Fig. C), all the resistance
should be infinite (Fig. D), if not the compressor has malfunctioned and needs to be replaced.
Fig. A Fig.B Fig.C Fig.D
If the resistance values are normal, then go to step 2.
Step 2: Disconncet the power wiring from the compressor, replace the main PCB of the unit and ensure correct
wiring, if compressor can start normally, it means the main PCB which was replaced was damaged. If compressor
still can’t start normally, replace the compressor.
Step 3: Replace the compressor
1
2
90
V.2