Junkers No Power / Control Board Not Energized

Heater does not start; display is blank and no lights are on.

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

Blown fuse, Tripped circuit breaker, Faulty power supply cable, Defective main control board

Safety: Turn off the main breaker before inspecting electrical connections.

Check outlet or supply: Verify the socket has power by plugging in another device, or check the dedicated circuit breaker.
Inspect appliance fuse: Many Junkers units have an internal fuse on the PCB or near the power entry; replace only with the same rating.
Examine power cord: Look for cuts or burn marks on the cable and terminal block.
Board replacement: If power is present but the board remains dead, the PCB likely needs replacement by a technician.

Hard 4/5

Main Control Board / Internal Fuse

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