Zanussi Control Relay Chatter / Power Supply Instability

Oven interior light and fan work, but elements cycle on and off very rapidly, causing poor cooking performance.

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

Weak mains supply, failing control board relays, faulty temperature sensor causing unstable readings, loose neutral connection

Safety first: Turn off power before inspecting wiring or control boards.

Check mains connections: Inspect the terminal block and main wiring for loose or burnt connections. Tighten as needed.
Test sensor: Verify the oven temperature sensor resistance is stable and within specification. Replace if readings jump or are inconsistent.
Control board replacement: If relays are audibly chattering and supply is stable, the control board may be defective and require replacement.

Hard 4/5

Main Oven Control Board (EOC)

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