L1 or L2-Phase Open Error

What does 04 mean?

An open circuit is detected in either the L1 or L2 phase of the main power input, indicating a missing power phase. This typically prevents the power circuit board from receiving a complete supply, leading to system shutdown or malfunction.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Inspect the wiring connections from the main power supply to the power circuit board for looseness or disconnection.

2. 4

   Inspect the power circuit board for any visible damage.