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What could be the cause if a refrigerated air dryer fails to start?

There are many reasons why a refrigerant dryer may fail to start; we need to analyze each situation individually and troubleshoot accordingly. Below, we will walk through the troubleshooting process step by step.

Time:

2026-05-29

What could be the cause if a refrigerated air dryer fails to start?
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  • What could be the cause if a refrigerated air dryer fails to start?

There are many reasons why a refrigerant dryer may fail to start; we need to analyze each situation individually and troubleshoot accordingly. Below, we will walk through the troubleshooting process step by step.

• Insufficient or excessive refrigerant: Check for leaks, evacuate the system, then add an appropriate amount of refrigerant, or remove any excess.

• Malfunction caused by leakage in the four-way valve: If the valve is damaged, it should be replaced.

• Poor condenser ventilation or airflow short-circuiting: Remove any obstructions on the outdoor side and clean the condenser.

• The capillary assembly (including the filter) is clogged, causing the suction temperature to rise: Please replace the capillary assembly.

• Protection relay failure: Use a multimeter to check whether the contacts close when the air compressor is not overheated. If they do not close, replace the relay. When replacing the air compressor, also inspect the start capacitor and the start relay; if either is damaged, both must be replaced as a pair.

• Air compressor unit failure, such as short circuit, open circuit, or enclosure grounding: Replace the air compressor after verification.

• Overpressure caused the pressure relay to activate: Analyze the root cause and implement appropriate measures to troubleshoot.

• If the system contains non-condensable gases (such as air), please evacuate the system and recharge it with refrigerant.

• Excessive operating current of the air compressor: Identify the cause and rectify the fault.

• When the ambient temperature around the outdoor unit is high: keep it away from heat sources and avoid direct sunlight.

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