Junkers Outlet Temperature Control Fault

E2 displayed; water temperature overshoots setpoint then drops, with frequent cycling.

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

Defective outlet NTC sensor, Poor thermal contact between sensor and pipe, Scale on outlet pipe, Control board regulation issue

Safety: Power off before touching sensors or pipes.

Check sensor mounting: Ensure the outlet NTC is firmly clipped to the pipe or fully inserted into its pocket with thermal paste if specified.
Clean limescale: Remove external scale from the outlet pipe around the sensor to improve heat transfer.
Inspect wiring: Look for loose or damaged wires between sensor and PCB.
Replace sensor: If readings are clearly wrong, replace the outlet NTC with a genuine Junkers part.

Medium 3/5

Outlet Temperature NTC Sensor

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