Power Synchronous Signal Error

What does 08 mean?

This fault indicates an issue with the power synchronous signal, which is critical for the controller to synchronize with the incoming AC power supply, detected during error postponement (U9 status). This signal is usually generated or monitored by the power circuit board. A loss or abnormality in this signal prevents proper control of power-related components, potentially leading to incorrect phase control or operational failure.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify the stability and waveform of the incoming AC power supply, ensuring there are no significant distortions or phase imbalances that could affect synchronization.

2. 4

   If wiring and external power are confirmed good, and there's no apparent board damage, replacing the power circuit board may be necessary.