15. "Check external security" error message from the Sensys Evo

A safety device on the device has tripped to prevent heating.
1. Flow of water that is too low. (prerequisite: 2 l / min 3 bar)
2. Error on the direction of water flow.
3.Electromagnetic water faulty.
4. The thermal switch on the oven body has tripped because the water temperature is too hot.
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