MUSTART Unstable Internal Power or Loose Supply Connection

Charger display and lights rapidly turn on and off (power cycling) without user input; charging may start and stop repeatedly.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Loose plug in outlet, failing internal low‑voltage power supply, intermittent neutral/line connection, overloaded branch circuit causing voltage dips

Safety warning: Rapid cycling can stress components. Do not ignore this behavior.

Check plug fit: Ensure the MUSTART plug is fully seated and not wiggling in the outlet.
Test outlet with another load: Use a different high‑draw appliance to see if the outlet maintains stable power.
Dedicated circuit: Confirm the charger is on a dedicated circuit with no other large loads.
Service if internal: If the outlet is stable but the charger still power cycles, the internal power supply on the main control board may be failing and needs replacement.

Hard 4/5

Main Control Board (Internal Power Supply)

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