U1
Klarstein Input Voltage Too Low / Power Supply Instability

U1 or low-voltage error appears; cooker may reset or not heat properly.

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Safety Warning

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.

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Possible Causes

Undersized extension cord or power strip, Household voltage sag, Faulty internal power supply on main PCB, Loose mains connector inside cooker

How to Fix / Troubleshooting

Safety: Always disconnect from mains before opening the unit.

Step 1 – Check power source:

  • Plug the cooker directly into a wall outlet, avoiding extension cords or multi-plugs.
  • Try a different outlet on a separate circuit.

Step 2 – Internal inspection:

  • Remove the bottom cover and inspect the mains input connector and wiring.
  • Ensure all spade connectors are tight and there are no signs of overheating.

Step 3 – Power supply board:

  • Inspect the low-voltage power supply section on the main PCB for bulging capacitors or burnt components.
  • If defective, replace the main control PCB or the separate power module if your model uses one.
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Repair Difficulty

Hard 4/5

Required Part

Main Control PCB
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