Numatic
Low Voltage Control Circuit Failure
Power indicator lights but none of the functions (pump, brush, suction) operate when their switches are pressed.
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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
Failed low-voltage transformer or power supply on PCB, Broken control wiring harness, Faulty function switches, Blown internal fuse on PCB
How to Fix / Troubleshooting
Safety first: Unplug the machine before removing covers.
- Check PCB fuse: Locate any internal fuses on the control board and test for continuity. Replace only with identical ratings.
- Test function switches: Use a multimeter to verify that pump, brush, and suction switches close correctly when pressed.
- Inspect harness: Follow the low-voltage harness from the PCB to the switches and sensors. Repair or replace any damaged sections.
- PCB replacement: If the low-voltage supply is missing and fuses and wiring are intact, the PCB likely needs replacement.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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