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Created on 01.23
Thermal Expansion Valve Adjustment Failure or Blockage — A One-Minute Troubleshooting Guide
Thermal Expansion Valve Adjustment Failure or Blockage — A One-Minute Troubleshooting Guide
The thermal expansion valve is the system's 'flow switch', responsible for supplying refrigerant to the evaporator. If it is too small or blocked, there will be insufficient refrigerant, leading to incomplete evaporation in the evaporator, low suction pressure, and reduced cooling effect.
Common Causes:
・The temperature bulb is not properly attached or positioned incorrectly, resulting in inaccurate temperature measurement.
・The valve core is stuck or worn, causing poor operation.
・The throttling port is blocked by impurities.
Quick Diagnostic Methods:
・Check the temperature bulb: Is it tightly attached to the suction pipe? Is the insulation intact?
・Inspect the valve body: Are there abnormal frost or ice formations?
・Examine the system: Low suction pressure, insufficient evaporator cooling, and abnormal return gas reheat temperature.
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Foshan City Chancheng District Xiyue industrial zone 4 row 2, China
Foshan City Chancheng District Xiyue industrial zone 4 row 2, China
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