Sime water heater shows E17; may be associated with sensor open circuit.

Safety: Isolate power before handling wiring.

Steps:

• Check connector: Ensure the NTC plug is fully inserted into the control board.
• Inspect wiring: Follow the cable from the sensor to the board, checking for breaks.
• Measure resistance: If the sensor reads infinite resistance (open), replace it.

Professional help: If replacing the sensor does not clear E17, the control board may need service.