Junkers Gas Modulation / Valve Control Error

E5 displayed; unit may not modulate correctly, causing very hot or very cool water.

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

Loose gas valve connector, Faulty modulation coil, Control board output failure, Incorrect gas adjustment

Safety: Do not attempt to adjust gas settings without proper instruments and certification.

Check connector: Ensure the modulation coil plug on the gas valve is secure.
Stable power: Verify the heater is not supplied through an undersized or unstable power source causing control issues.
Professional service: If E5 remains, a technician must test the gas valve and PCB and perform combustion analysis.

Professional Required 5/5

Gas Valve Modulation Coil

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