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V4+R VRF 50/60Hz

201608 89

Part 5 - Diagnosis and Troubleshooting

xL2 troubleshooting 4.19.8

Step 1: Check inverter module

 Check the DC voltage between terminals 1 and 2. The normal value is 510-580V, if the voltage is higher than 580V, go

to Step 2.

Figure 5-4.11: Inverter module terminals

Step 2: Check capacitor board

 Check the voltage between terminals P and N on the capacitor board. The normal value is 510-580V. If the voltage is

not in the normal range, there is a problem with the electrolytic capacitor power supply. Check the power supply for

high or unstable voltage. If the power supply voltage value is normal, then the main PCB has malfunctioned and

needs to be replaced.

Figure 5-4.12: Capacitor board terminals

xL8/xL9 troubleshooting 4.19.9

Step 1: Check compressor

 The normal resistances of the inverter compressor are 0.9-5Ω among U V W and infinite between each of U V W and

ground. If any of the resistances differ from these specifications, the compressor has malfunctioned.

 Refer to Figures 5-4.6 and 5-4.7 in Part 5, 4.19.6 “xL0 troubleshooting”. If the resistance values are normal, go to Step

Step 2: Check compressor and main PCB

 If there is another unit nearby (either in the same system or another system) that is operating normally, its electric

control box can be used to determine whether the xL8/xL9 error is being caused by a compressor fault or a main PCB

fault:

 If using another unit in the same system as the unit with the error to perform the test, set it as the master unit

(address 0); if using a unit in another system, use the master unit.

 Disconnect the power wires of the compressor referenced in the xL8/xL9 error code.

 In the unit that is operating normally, disconnect the power wires that connect a compressor to the electric

control box and use them to connect the compressor with the xL8/xL9 error to the electric control box of the

unit that is operating normally. Ensure that the U, V, W terminals are connected in the right order, and then start

the system that is operating normally.

 If the compressor with the xL8/xL9 error runs normally, replace the main PCB of the unit with the xL8/xL9 error

Midea V4+R Series User Manual

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