Siemens Start Circuit / Safety Interlock Issue

Dryer display and lights work but Start button does nothing

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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

Faulty Start/Pause button, Door not detected as closed, Child lock function active, Defective user interface PCB

How to Fix / Troubleshooting

Safety first: Disconnect power before opening the control panel.

  • Check door and indicators: Ensure the door is fully closed and any door-closed indicator is lit. If your Siemens model has a child lock, disable it according to the user manual.
  • Try different programs: Select another program and press Start to rule out a specific program fault.
  • Test Start button: Press the Start/Pause button repeatedly. If it feels stuck or unresponsive, the switch may be faulty. Access the control panel and test the button switch with a multimeter.
  • Inspect UI board: Look for cracked solder joints or damage around the Start button on the PCB. Repair or replace the user interface board if necessary.
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Repair Difficulty

Medium 3/5

Required Part

User Interface Control Board
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