Rongsheng Refrigerator Repair Discourse; PTC Start Component Testing
The PTC start component is a thermistor with a positive temperature coefficient. When the PTC start component is damaged, it usually results in an open circuit. At this point, the refrigerator compressor cannot start normally, causing a large current in the circuit, which triggers the thermal protection element to disconnect. When the temperature of the thermal protection element drops to a certain value, it reconnects the circuit, but the overcurrent quickly disconnects the protection again. This repeated disconnection and reconnection causes a clicking sound ("ta, ta") inside the refrigerator. Over time, due to overcurrent impact, it can lead to the compressor being burned out.
To determine if the PTC start component is functioning properly: First, use a multimeter on the Rx1 setting to measure the resistance, which should be approximately 154Ω. Then, connect a 100W light bulb in series with the PTC start component and plug it into a 220V AC power source. The bulb should light up immediately, then after about ten seconds, it will gradually dim and eventually turn off completely. At this point, cut off the power supply, wait a few minutes, and reconnect the power. The bulb should light up again, confirming that the PTC start component is working correctly.
When the refrigerator is running, if you hear a "ta, ta" sound coming from inside, immediately disconnect the power and check the PTC component. If the PTC start component is damaged, replace it with a new PTC start component.
Technical release by Rongsheng Refrigerator After-sales Service Center in Beijing on September 23, 2011.