7-segment LED not lit — Multi controller board power issue

What does 7seg LED (not lit) mean?

If the 7-segment LED display on the outdoor multi controller circuit board is not lit when all SW1 switches are off, it suggests a power supply problem to the board. This can be caused by faulty wiring, a tripped breaker, or issues with the power circuit board itself.

• Missing 290-350 V DC voltage to the CNDC connector
• Incorrect wiring to the multi controller circuit board
• Main power breaker tripped or issue with main incoming power
• Fault in the main power board or multi controller circuit board

Click steps to track your progress.

1. 1

   Check the main electrical breaker that supplies power to your Mitsubishi Electric MXZ outdoor unit and ensure it has not tripped.

2. 2

   Inspect all accessible wiring connections to the outdoor multi controller circuit board for any looseness or damage.

3. 3

   If the LED remains unlit, contact a qualified service technician to further inspect the unit's power supply and circuit boards.