MrCool U-match MDUI18024, Service Manual

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MRCOOL Universal Service Manual
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Troubleshooting ：
3.4.17 “P6” Master Control and Driver Communication Error
Error display: ODU mainboard LED displayer
Error judgment condition and method:
If there is no other malfunction and the communication between master control and driver is cut off for 30s,
then it can be judged that the communication between master control and driver is faulted. System will shut down
for protection.
Possible reason:
■Communication wire between master control and driver is not well connected, or has bad contact, or is broken.
■The switch power of drive board is abnormal, therefore, the 3.3V power voltage is abnormal.
■Communication circuit of the drive board or the master control board is abnormal.