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Troubleshooting Solenoid Valve in Refrigerator
The main function of the solenoid valves in refrigerators is to transform the refrigerant flowing direction, control the refrigerating state at different indoor temperatures and optimize the refrigerating structure to achieve the ideal settings and to meet different user demands.
There are different types of solenoid valves. The currently prevailing solenoid valves for refrigerators can be divided into two types. The first type is the monostable solenoid valve, and the other type is the bistable solenoid valve. The bistable solenoid valve can be further divided into two types, including the two-position three-way type and the six-position five-way type. To install the refrigerator with two refrigerating compartments, the marked exit of the solenoid valve is the air exhaust end. To install the refrigerator with more than three refrigerating compartments, the working direction should be clearly distinguished.
Operating process of refrigerator solenoid valve
When the compressor is operating, the refrigerant flows through the solenoid valve → the first capillary tube → the evaporator of the refrigerating compartment → the evaporator of the freezing compartment → compressor. This means the first loop (main) refrigerating circle is finished.
When the solenoid valve is powered on, the refrigerant passes through the solenoid valve → the secondary capillary → the evaporator of the freezing compartment → compressor. This means the second loop (secondary) refrigerating circle is finished to realize the double-loop control.
Troubleshooting solenoid valve in refrigerator
When the compressor is working, but certain compartment or two compartments or three compartments for refrigeration, freezing, temperature variation or partial freezing cannot refrigerate. Then, you should check the solenoid valve (to see whether there is one compartment working). Below are the main troubleshooting methods:
1. Troubleshooting of the monostable solenoid valve
Both the monostable solenoid valve and the bistable solenoid valve might suffer leakage. Therefore, the solenoid valve check is also an indispensable step. When the low voltage and high voltage of the refrigerator undergoes the pressure-maintaining leakage detection, the solenoid valve is connected with the high voltage part. Since the solenoid valve is large and installed on the narrow space nearby the compressor, the valve body should be disassembled. After disassembling, if the welding part of the valve body is found with oil stains, it means there are obvious leakage points at this part, and the welding requires strengthening at these parts. When there are no obvious oil stains, apply the soap to the surroundings of the welding joint of the solenoid valve. If there are bubbles flowing out, it means there are minor leakages. Upon detection, the solenoid valve cannot be soaked into the water, which might otherwise cause damping and short circuit of the coil and driver board.
There are different types of solenoid valves. The currently prevailing solenoid valves for refrigerators can be divided into two types. The first type is the monostable solenoid valve, and the other type is the bistable solenoid valve. The bistable solenoid valve can be further divided into two types, including the two-position three-way type and the six-position five-way type. To install the refrigerator with two refrigerating compartments, the marked exit of the solenoid valve is the air exhaust end. To install the refrigerator with more than three refrigerating compartments, the working direction should be clearly distinguished.
Operating process of refrigerator solenoid valve
When the compressor is operating, the refrigerant flows through the solenoid valve → the first capillary tube → the evaporator of the refrigerating compartment → the evaporator of the freezing compartment → compressor. This means the first loop (main) refrigerating circle is finished.
When the solenoid valve is powered on, the refrigerant passes through the solenoid valve → the secondary capillary → the evaporator of the freezing compartment → compressor. This means the second loop (secondary) refrigerating circle is finished to realize the double-loop control.
Troubleshooting solenoid valve in refrigerator
When the compressor is working, but certain compartment or two compartments or three compartments for refrigeration, freezing, temperature variation or partial freezing cannot refrigerate. Then, you should check the solenoid valve (to see whether there is one compartment working). Below are the main troubleshooting methods:
1. Troubleshooting of the monostable solenoid valve
- Use the multimeter to check whether there is 220 AC or 110V voltage at the solenoid valve plug.
- Check whether the driver board fuse is burnt out.
- Test whether the capacitance on the driver board is punctuated and has electricity leakage
- Check whether the solenoid valve coil has the resistance of 9.6K.
- Use the multimeter to check whether the solenoid valve coil resistance is above 2K (the resistance value differs according to different requirements of the refrigerator manufacturers).
- Use the multimeter to check the impulse voltage and adjust the multimeter functional button to the AC gear, 50V. Use the black instrument testing pen to touch the N wire, and use the red instrument testing pen to touch the mainboard to output the signal terminal of the solenoid valve. Under general conditions, the mainboard will provide the solenoid valve with an impulse signaler at the 15th second (which is decided by the requirements of various refrigerator plants but mostly falls within the scope). The output length of the impulse signal is decided by the mainboard design app. When the signal is output, the multimeter hand will sway to the left for seconds. If the hand does not move, it means the mainboard has faults rather than the solenoid valve has faults.
Both the monostable solenoid valve and the bistable solenoid valve might suffer leakage. Therefore, the solenoid valve check is also an indispensable step. When the low voltage and high voltage of the refrigerator undergoes the pressure-maintaining leakage detection, the solenoid valve is connected with the high voltage part. Since the solenoid valve is large and installed on the narrow space nearby the compressor, the valve body should be disassembled. After disassembling, if the welding part of the valve body is found with oil stains, it means there are obvious leakage points at this part, and the welding requires strengthening at these parts. When there are no obvious oil stains, apply the soap to the surroundings of the welding joint of the solenoid valve. If there are bubbles flowing out, it means there are minor leakages. Upon detection, the solenoid valve cannot be soaked into the water, which might otherwise cause damping and short circuit of the coil and driver board.
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