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mason08Aug 21, 2025
Why is my Blue Box SIGMA 2002 compressor not running and the display is off?
- SSamantha PerezAug 21, 2025
The compressor might not be running because there is no mains power. Verify the presence of mains power.
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The compressor might not be running because there is no mains power. Verify the presence of mains power.
What to do if my Blue Box SIGMA 2002 compressor is not running and the display is on with alarm “L1” and/or “L2”?
If compressor 1 and/or 2 are not working, and the display shows alarm “L1” and/or “L2”, it could be due to: * A completely empty refrigerant circuit. Check the refrigerant circuit with a leak detector after pressurizing to approximately 4 bar. Repair the leak, apply vacuum, and charge the circuit. * A faulty low-pressure switch. Check and replace if necessary. * A clogged metallic coil filter, resulting in low airflow (only LC/HP). Clean the filter with compressed air. * A clogged refrigerant filter. Check and replace if necessary. * A faulty water circulator pump. Check and replace if necessary.
What to do if my Blue Box SIGMA 2002 compressor is not running and the display is on with alarm “C1” and/or “C2”?
If compressor 1 and/or 2 are not working and the display shows alarm “C1” and/or “C2”, it could be due to: * Insufficient refrigerant charge. Find the leak with a leak detector, repair it, and recharge the circuit. * A locked 4-way valve. Replace the valve. * Lack of oil. Check the quantity of oil in the circuit and replenish as necessary. Ensure the circuit has all necessary measures to ensure oil return to the compressor. * Condenser entering water temperature is too high. Check the temperature and flow of condenser entering water.
What does it mean if there is ice on the liquid refrigerant pipe of my Blue Box SIGMA 2002?
Ice forming on the liquid refrigerant pipe can be caused by: * A clogged liquid refrigerant filter. Replace the filter. * A valve on the liquid refrigerant line (if present) not being completely open. Fully open the valve.
What does it mean when my Blue Box SIGMA 2002 compressors run constantly?
If the compressors run constantly, it could be due to: * An incorrectly set or faulty operating thermostat. Check the setting and replace the thermostat if necessary. * A lack of refrigerant gas charge. Check and recharge if necessary. * Excess thermal load. Reduce the thermal load.
What should I do if my Blue Box SIGMA 2002 is making anomalous noises?
If you notice anomalous noises from the system: * If the compressor is noisy, contact a service organization for a check and replacement if necessary. * If the thermostatic valve is noisy, contact a service organization for a check and to replenish the refrigerant charge. * If pipes are vibrating, contact a service organization to secure the pipelines. * If casing panels vibrate, check that the panels are properly fastened; contact a service organization if necessary.
Why won't my Blue Box SIGMA 2002 compressor run, even though the display is on and there are no alarm messages?
If the display is on but the compressor isn't running and there are no alarm messages, the possible causes are: * The unit is in stand-by mode. Start the unit (see relative section of the manual). * There is no consent from the service thermostat. This means the system is at set-point temperature with no heating/cooling demand; check settings and operation. * There is no external consent. Check the operation of circulator pumps, flow switches, bleed air from the system; check that contacts 1 and 2 are closed, and check other external consents. * The compressor motor is burnt out or the compressor is seized. Replace the compressor. * The anti-recycle timer is running. Wait for 5 minutes until the timer generates consent.
What does it mean if my Blue Box SIGMA 2002 Chiller compressor is not running and the display is On with alarm "FL"?
If the compressor is not running and the display shows alarm "FL", it indicates either no water flow at the evaporator, in that case check hydraulic system, or a faulty flow switch, in that case check contact of flow switch and replace if necessary.
What does it mean if my Blue Box SIGMA 2002 Chiller compressor is not running and the display is On with alarm “F1” or “F2”?
If the compressor is not running and the display shows alarm “F1” or “F2”, it means the fan thermal protection has intervened. Check the insulation between windings and between windings and earth; replace the fan if necessary (only version LC and LC/HP).
What does it mean if my Blue Box Chiller compressor is not running and the display is On with alarm "A1"?
If the compressor is not running and the display shows alarm "A1", it could be due to: * No consent of defrost thermostat due to insufficient water flow rate. Check the hydraulic circuit and wait until the water temperature exceeds the value necessary for the unit to restart. * No consent of defrost thermostat due to insufficient glycol concentration. The programmed set-point is too low for the percentage of glycol in the circuit. Increase the glycol percentage and reduce the defrost set-point.
Details on the hermetic scroll type compressors used in the SIGMA 2002 series units.
Description of the refrigerant circuit components and their functions within the unit.
Overview of the electrical panel, including main components and control functions.
Essential safety rules to be followed for operation and maintenance of the unit.
Analysis of mechanical risks and the solutions adopted to mitigate them.
Identification of electrical risks and compliance with safety standards.
Essential checks to perform before starting the unit for the first time.
Procedure for starting the unit using the microprocessor controller.
Procedure for checking the refrigerant charge using sight glass and pressure gauges.
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