Blue Box SIGMA 2002 - User Manual

Questions and Answers

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bennettdebbieSep 13, 2025
How to turn on my Blue Box SIGMA 2002 if the main power switch is Off?
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  Jeremy SmithSep 13, 2025
  If the main power switch is off (position "O"), turn the mains power selector to position "I".
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Jeremy StricklandAug 25, 2025
What to do if my Blue Box SIGMA 2002 compressor is not running and the display is on with alarm “L1” and/or “L2”?
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  Roy HayesAug 25, 2025
  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.
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Tina SanchezAug 27, 2025
What to do if my Blue Box SIGMA 2002 compressor is not running and the display is on with alarm “C1” and/or “C2”?
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  Aaron ThompsonAug 27, 2025
  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.
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Kimberly StewartAug 29, 2025
What does it mean if there is ice on the liquid refrigerant pipe of my Blue Box SIGMA 2002?
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  Tina MiddletonAug 29, 2025
  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.
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Travis ZimmermanAug 31, 2025
What does it mean when my Blue Box SIGMA 2002 compressors run constantly?
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  Gregory LivingstonAug 31, 2025
  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.
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htuckerSep 1, 2025
What should I do if my Blue Box SIGMA 2002 is making anomalous noises?
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  Erik Solomon MDSep 1, 2025
  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.
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vmcgeeNov 27, 2025
What causes insufficient capacity in my Blue Box SIGMA 2002 Chiller, even though the display is on without alarms?
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  Luis CampbellNov 27, 2025
  Insufficient capacity, with the display on but no alarms, can stem from: * Insufficient refrigerant charge: Check refrigerant circuits with a leak detector, repair any leaks, and recharge the circuit. * Presence of moisture in the refrigerant circuit: Replace the refrigerant filter and, if necessary, dehydrate and recharge the circuit. * One compressor failing to start, with the power circuit open and compressor contactor energized: Find and eliminate the cause of the protection intervention; change the fuses. If the fuses blow immediately, replace the compressor. * A compressor failing to start, with fuses OK but the compressor contactor de-energized: Check voltage across the compressor contactor coil and continuity of the coil; if necessary, replace the coil. * A 4-way reversi...
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derek26Sep 15, 2025
What to check if my Blue Box Chiller compressor isn't running and the display is off due to no power to control circuits?
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  David PonceSep 15, 2025
  If there is no power to the control circuits, check the condition of fuses FU50, FU51, and FU52. Also, check the operation of the transformer.
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theresa95Sep 12, 2025
What does it mean if my Blue Box SIGMA 2002 compressor is not running and the display is On, with alarm "E3" or "E5"?
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  hvegaSep 12, 2025
  If the compressor is not running and the display shows alarm "E3" or "E5", it could indicate: * Faulty or disconnected resistance RK3 or RK4 (only version LC and LC/HP). Check the resistance and replace if necessary. * Interrupted connections to the pressure sensor (HP version only or if condensation pressure control with fan speed regulator is fitted with version LC and LC/HP). Restore the correct connections to the pressure sensor (“E3” refers to compressor 1, “E5” refers to compressor 2). * A faulty pressure sensor (only on HP version or if condensation pressure control with fan speed regulator is fitted with version LC and LC/HP). Replace the pressure sensor (“E3” refers to compressor 1, “E5” refers to compressor 2).
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Timothy BakerSep 8, 2025
What does it mean if my Blue Box Chiller compressor is not running and the display is On with alarm "A1"?
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  Misty ConleySep 8, 2025
  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.