Display shows E02 and water heater shuts down shortly after opening a hot tap

Safety: Isolate electrical power at the breaker before removing covers.

• Access the sensor: Remove the front cover. Locate the outlet temperature sensor (NTC) clipped or screwed into the hot water outlet pipe or heat exchanger outlet on the Dimplex unit.
• Visual inspection: Check for signs of moisture, corrosion, or physical damage to the sensor body and wiring. Ensure the sensor is firmly seated against the pipe or in its well.
• Check connections: Unplug the NTC connector from the control PCB, inspect for corrosion or bent pins, then reconnect securely.
• Basic resistance check (optional): With power off, use a multimeter to measure resistance across the NTC leads. Compare to Dimplex service data (typically 10k–20kΩ at room temperature). An open circuit or zero ohms indicates a failed sensor.
• Reset and test: Restore power and run hot water. If E02 returns, replace the outlet NTC sensor.

Note: If a new sensor does not clear the fault, the control PCB may be defective and should be diagnosed by a professional.