Junkers No Power / Dead Appliance

Furnace does not start at all, no display, no response

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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

Blown mains fuse, Faulty Junkers main switch, Loose power terminal block, Failed control board power supply

How to Fix / Troubleshooting

Safety first: Verify power is off before opening the electrical compartment.

  • 1. Check external power: Confirm that the circuit breaker or fuse feeding the furnace is on and not tripped. Test the outlet or supply with another device.
  • 2. Inspect mains cable and plug: Look for damage or overheating. Replace if necessary.
  • 3. Internal fuses: Open the control box and locate internal fuses. Test with a multimeter and replace blown fuses with identical ratings. If a fuse blows again, a deeper fault exists.
  • 4. Main switch and terminals: Test the Junkers main on/off switch for continuity. Tighten all power terminals.
  • 5. Control board: If supply and fuses are good but the display remains off, the PCB power supply is likely defective and the board must be replaced by a technician.
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Repair Difficulty

Medium 3/5

Required Part

Main Control Board
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