Temperature Detection Error

What does E19. mean?

This fault indicates an error in the inverter's cooling fin temperature detection system, such as a sensor disconnection or malfunction. This means the inverter cannot accurately monitor its internal temperature, posing a risk of overheating if left unaddressed, which could lead to critical component failure.

• Cooling fin temperature sensor (thermistor or RTD) open circuit or short circuit, causing an out-of-range resistance reading at the control board.
• Poor connection, corrosion, or mechanical damage on the sensor wiring or input terminals (e.g., T1/T2) to the inverter's control board.
• Internal hardware malfunction or defect within the inverter's control board responsible for temperature sensor signal processing.
• Excessive electromagnetic interference (EMI) on sensor wiring disrupting low-level temperature signals, leading to erratic readings.

Click steps to track your progress.

1. 1

   Disconnect power to the inverter. Measure the resistance of the cooling fin temperature sensor directly at its terminals (e.g., T1 and T2). Compare reading to the sensor's datasheet specification (e.g., 10 kΩ NTC at 25°C).

2. 2

   Inspect the sensor wiring for damage, cuts, or loose connections between the sensor and the inverter's control board terminals. Ensure screw terminals are torqued correctly.

3. 3

   Verify the continuity of the sensor wiring from the sensor itself to the inverter's input terminals using a multimeter to confirm no breaks.

4. 4

   Clean any visible corrosion or dirt from the sensor input terminals on the control board using an appropriate electrical contact cleaner.

5. 5

   If sensor resistance is out of spec or wiring is verified good, consider replacing the main control board as the temperature input circuit may be faulty.