The temperature display of the temperature controller responds very slowly, especially when it is first powered on, the measured value slowly rises, and it takes a long time to reach the actual value. At this point, the filtering parameter setting value of the temperature controller should be checked. The value should not be too large. The larger the setting, the slower the measurement response of the temperature controller. If it is set to "0", it means canceling digital filtering. The display will be fast, but the fluctuation of the display will also increase. The value is generally set to 0-5.

The contact signal output by the temperature controller is a passive signal and cannot drive an AC solid-state relay because the solid-state relay needs to trigger voltage drive. But a DC voltage can be connected in series in the contact signal circuit output by the relay, and the selection of voltage value can be determined by the triggering voltage of the solid-state relay. A DC voltage of about 10V in series can mostly drive the solid-state relay.

The main reason for the open circuit of the temperature controller is due to the detachment of the wiring to the clip or the leakage of the temperature sensing agent in the temperature sensing package. The temperature sensing agent leaks, and the pressure in the temperature sensing chamber decreases to atmospheric pressure. The lever connected to the moving contact is only subjected to the tension of the balance spring, so the moving and stationary contacts cannot be closed. The temperature controller is in an open circuit state, and the compressor cannot be started. To further check, support the temperature sensing tube with your hand and slightly add a cylinder to it. If the contact still does not close, it indicates that the temperature sensing agent is indeed leaking.

Causing the compressor to not start, the dynamic and static contacts of the temperature controller cannot be disconnected, causing the compressor to not run, and the contact of the temperature controller cannot be disconnected, causing the motor of the refrigerator compressor to run non-stop. In addition to being caused by the weak elastic force of the balance spring, it may also be caused by the accumulation of words on the contact and adhesion. In this case, the power supply can be cut off, the temperature controller knob can be repeatedly rotated from the "stop" to the "cold" position, and then connected to the power supply to restore normal operation, indicating that the fault has been resolved.

The temperature control of the thermostat is too low, causing hunger., It should be noted that whether it is a new or repaired temperature controller, debugging should be carried out after installing the refrigerator to ensure that the box temperature is within the rated range. In general, the temperature of the refrigeration room is 2 degrees. If the contact of the temperature controller only closes when it is above 10 ℃, it needs to be adjusted. When adjusting the operation, it is necessary to first check whether the temperature sensing tube is installed properly.

Solution: Firstly, it is necessary to check whether the wiring of the equipment is properly connected and whether the contact is good. Next, it is necessary to check if the connection of the cable is correct.