What does the Secop BD compressor controller LED flash code 3 blinks mean?

Three flashes on the Secop BD inverter controller indicates a high condenser temperature fault (sensor reading above 90°C). Check condenser fan operation, condenser coil cleanliness, and ambient temperature. Also verify the condenser temperature sensor is correctly positioned on the condenser outlet and is not damaged.

How do I set the variable speed on a Secop BD compressor?

The Secop BD compressor speed is set via a 0-5V or 0-10V analog input on the BD controller, or via a PWM signal. Map the control signal to the desired speed range using the DIP switch settings on the controller. Minimum speed is typically 1800 rpm; maximum varies by model (2000-4500 rpm). Consult the BD application guide for your model's speed range.

What refrigerants are compatible with Secop compressors?

Secop offers compressors for R134a, R600a, R404A, R290 (propane), and R448A depending on the product family. The BD series handles R134a and R290; SC hermetic series covers R134a, R600a, and R404A. Always verify refrigerant compatibility on the compressor nameplate before servicing — flammable refrigerants (R600a, R290) require special precautions.

How do I replace a Secop SC compressor?

Before replacing a Secop SC compressor: recover refrigerant per F-Gas regulations, cut the process tube and flush the system with dry nitrogen to remove moisture and debris. Install the new compressor with new filter-drier, evacuate to below 300 microns, and hold vacuum for 30 minutes before charging. Use POE oil charge as specified on the new compressor label.

What causes a Secop GE compressor to be noisy?

Noise in Secop GE compressors is often caused by: liquid slugging (check liquid line solenoid valve and startup sequence), worn piston rings or valve plates (internal wear, compressor requires replacement), loose mounting (check rubber grommets and bolts), or incorrect oil level (check through the sight glass if equipped). Liquid slugging on startup is prevented by a pump-down control circuit.

refrigeration

Secop (Danfoss Compressors) Troubleshooting Assistant

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By Octavian Ghindea

Co-founder & CTO · Reviewed May 2026

What error codes does Secop (Danfoss Compressors) display?

3 blinks

High condenser temperature — check fan and condenser coil

2 blinks

Low battery voltage protection (DC models)

5 blinks

Motor overload — check voltage and refrigerant state

1 blink

Internal overtemperature protection activated

Common questions about Secop (Danfoss Compressors) equipment

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