How to deal with the fault of Siemens inverter F0012? -Solutions - Huaqiang Electronic Network

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F0012 is a fault code that indicates the inverter has lost its temperature signal. This usually means there's an issue with the motor temperature sensor or its connecting cable, such as an open circuit or short circuit. To identify the exact cause, you can use a systematic approach to isolate the problem. First, use a multimeter to check the continuity of the cable. If the cable shows any signs of damage or breakage, replace it and see if the issue persists. If possible, try swapping the inverter with another identical unit to determine whether the problem lies with the inverter itself or with the connected components. This can help you quickly rule out hardware issues on the inverter side. In most cases, F0012 is caused by a disconnected temperature sensor. However, if the inverter reports this error immediately upon power-up, it's likely a real disconnection. But if the error occurs after the fan has been running for 5–6 minutes, it might be due to a temporary "temperature sensor circuit disconnection" caused by internal heat. This could result from thermal expansion and contraction, leading to issues like poor solder joints, loose pin connections, or oxidized contacts. Another possibility is that the temperature sensor itself is faulty. Some sensors may fail when heated, which can be tested by replacing it with a known good one. If the error disappears after replacement, the original sensor was likely the culprit. It's also important to check for environmental factors that might affect the sensor’s performance, such as high humidity or extreme temperatures. Ensuring proper installation and regular maintenance can prevent many of these issues from recurring.