E12 — HU ZONE2 Water Mixing Valve Temperature sensor Abnormality

What does E12 mean?

This error indicates a problem with the temperature sensor for the water mixing valve in Hydro Unit Zone 2. The sensor might be disconnected or have an electrical fault (open or short circuit).

• Loose or damaged wiring to the Zone 2 water mixing valve temperature sensor.
• A faulty Zone 2 water mixing valve temperature sensor.
• An intermittent electrical issue affecting sensor readings.

Click steps to track your progress.

1. 1

   Turn off the main power to the Haier unit at the circuit breaker.

2. 2

   Wait for at least 30 seconds.

3. 3

   Restore power to the unit and check if the error code clears.

4. 4

   If the error persists, contact a qualified service technician to inspect the sensor and its connections.