How to troubleshoot Air-conditioning open phase | Mitsubishi VRF | error 4102 

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Check the error at cu (cu pcb light blinking)

This is new model I don't know how to check error code MSYGN18VF

In this remote there is no check button in this remote

@@akashshaw214 check outdoor light blinking

Check error code at outdoor unit

The aircon connect to the intelligent touch manager or centralised control?

Do you replace indoor pcb?

@@BonMj aircon connected to centralised control. The older type one. Beside CRC , there is a scheduled timer controller. Originally only the scheduled timer controller blinking UE. After 1 mth, both controllers flashing UE and the CRC (randomly around 15 units, dots flashing, across different zones in the CRC). And we checked the indoor remote setting for group zone became default 100. Not sure is it because of this? We nv change any indoor pcb. And all units working , only the CRC and scheduled timer controller flashing UE

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