Error 4 message on GIGA X8/X8c X3/X3c

My GIGA X8/X8c X3/X3c machine has an Error 4 on the screen

The machine has a faulty temperature sensor and requires an engineer visit. Please turn off the machine.

If you have a Maintenance & Care Plan with Amamus, this should be covered under your warranty.

To arrange for an engineer visit, please raise a ticket via this Support Form.

https://support.amamus.coffee/knowledge/kb-tickets/new