Hob displays error message E4 / E401 / E402 / E403 / E421...

Issue

• Hob displays one of the following error messages: E4 / E401 / E402 / E403 / E421 / E422 / E423 / E431 / E432 / E433.

Applies to

• induction hob
• cooker with induction hob

Resolution

E4 / E401 or similar error codes are an indicator that overheating protection is in operation, this may be due to an installation issue or using unsuitable cookware. If the below steps do not resolve the issue, we recommend requesting a visit from a service engineer.

1. Switch the hob off and allow it to cool by removing any cookware.

The error code should disappear once the hob cools down. (Residual heat indicator "H" can stay for a while).

2. Please ensure the cookware you are using is suitable for induction.

Induction-safe cookware should be iron or iron-based with a flat base for good conduction.

You can check if a pot or pan works on induction by placing a kitchen magnet on its bottom:

• If the magnet sticks firmly → Induction compatible.
• If it doesn’t stick → Not compatible.

Refer to the article: What cookware is suitable for cooking zones with induction heating?

3. Disconnect the appliance from power for at least 30 seconds. 

Reconnect it and switch it back on.

For built-in appliances, there’s no need to physically unplug or disconnect the cable because they are hardwired or integrated into the kitchen setup. Instead, you can reset or cut power using the dedicated safety switch or circuit breaker in your electrical panel.

If the above advice does not resolve the problem, we recommend requesting a visit by a service engineer.

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