A7 — Hot water NTC has an open circuit or short circuit

What does A7 mean?

The NTC sensor that measures the hot water temperature is experiencing either an open circuit (no signal) or a short circuit (incorrect signal). This prevents accurate temperature readings for hot water.

• The hot water NTC sensor is faulty or has failed.
• The connection cable to the hot water NTC sensor is damaged or disconnected.
• Loose or corroded connections at the sensor or circuit board.

Click steps to track your progress.

1. 1

   Check the hot water NTC sensor and its connection cable for any visible damage, wear, or loose connections.

2. 2

   Ensure all cable connections are secure and properly seated.

3. 3

   If damage or fault is identified, replace the hot water NTC sensor and/or its connection cable.