Tesy heater shows E16; display may indicate sensor mismatch or configuration error after replacing parts.

Safety first: Disconnect power before adjusting any jumpers or replacing sensors/boards.

Steps:

• Verify part numbers: Check that the replacement NTC sensors and control board are specified for your exact Tesy model and capacity (e.g., 80 L, 120 L).
• Check board configuration: Some boards have jumpers or DIP switches to select tank volume or sensor configuration. Compare their positions with the service manual or the original board.
• Replace incorrect parts: If a generic or wrong sensor was installed, replace it with the correct Tesy sensor type (e.g., 10 kΩ NTC at 25°C).
• Factory reset: Perform a factory reset if the model supports it to reload default configuration.
• Test: Restore power and confirm that E16 clears and temperature readings are stable.