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What do the error codes mean on the Xiaomi Instant Hot Water Dispenser?

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What do the error codes mean on the Xiaomi Instant Hot Water Dispenser?

For your reference, here are the meanings of these error codes:
1. E1 indicates an issue with the temperature sensor. To resolve it, try reconnecting the power. If the issue persists, contact the local after-sales service center for repair;
2. E2 suggests an abnormal heating temperature. Ensure the water temperature in the water tank is below 45°C, then reconnect the power and device about 100mL of room temperature water to cool the heating element. The error should clear automatically;
3. E3 occurs when the water inlet temperature is too low. Move the device to an environment above 5°C and let it sit for about 30 minutes to clear the error automatically.