Common Alarms, Inspection and Troubleshooting Methods for Anges Industrial Chillers

1. High Pressure Alarm 

• Poor heat dissipation of the condenser
• Excessive refrigerant filling
• Blocked or scaled condenser
• Abnormal cooling water flow (water-cooled chiller)
• High ambient temperature (air-cooled chiller)

• Clean condenser fins and dust thoroughly to ensure unobstructed heat dissipation.
• Check whether the cooling fan or cooling tower operates normally.
• Confirm cooling water pump and water flow are normal for water-cooled models.
• Check and recover excessive refrigerant if needed.
• Restart the unit after the pressure returns to normal.

2. Low Pressure Alarm 

• Insufficient refrigerant or refrigerant leakage
• Blocked filter drier or expansion valve
• Too low chilled water flow
• Low ambient temperature during operation

• Check the whole pipeline for refrigerant leakage and repair leaks.
• Replace blocked filter drier and clean the expansion valve.
• Check the chilled water pump, pipeline valve and filter to ensure normal water flow.
• Supplement refrigerant according to the standard after confirming no leakage.

3. Chilled Water Flow Alarm

• Water pump not started or pump failure
• Water pipeline valve not fully opened
• Pipeline blockage or filter clogging
• Air trapped inside the water circuit
• Damaged water flow switch

• Start the chilled water pump and check whether the pump runs normally.
• Fully open all water circuit valves.
• Clean the water filter and remove pipeline dirt and blockages.
• Exhaust air from the water pipeline completely.
• Check and replace the flow switch if it is faulty.

4. Overload / Overcurrent Alarm (Compressor Overload)

• Unstable power supply voltage or phase loss
• Compressor aging or mechanical friction failure
• Excessive refrigerant load
• Poor ventilation and high operating temperature

• Check the power supply voltage, phase sequence and wiring condition.
• Check whether the compressor has abnormal noise and overheating.
• Adjust refrigerant volume to the standard range.
• Improve on-site ventilation environment.
• Restart the unit after cooling down and eliminating faults.

5. Water Temperature Sensor Failure Alarm

• Loose or fallen off sensor wiring
• Sensor aging and damage
• Short circuit or open circuit of signal line

• Check and re-fix the sensor wiring plug.
• Inspect the signal line for damage and short circuit.
• Replace the temperature sensor if it fails.

6. High Water Temperature Alarm

• Excessive ambient load
• Insufficient refrigeration capacity of the unit
• Dirty and blocked condenser/evaporator
• Refrigerant shortage

• Clean condenser and evaporator regularly to improve heat exchange efficiency.
• Check whether the refrigerant is sufficient.
• Confirm the unit model matches the on-site cooling load.
• Reduce instantaneous equipment load properly.

Safety Notice

As one of the largest chiller manufacturers in South China, Anges Chillers boasts 22 years of professional experience in chiller R&D and production. We strive to provide customers with the optimal chiller solutions. You are warmly welcome to contact Anges at any time.