What does Castel error code OL mean?

Error code OL on Castel equipment indicates compressor overload — check motor current draw. Refer to the Castel service manual for specific diagnostic steps and safety precautions before troubleshooting.

How do I reset a Castel unit after a fault?

To reset a Castel unit, first resolve the root cause of the alarm. Then power cycle the unit or press the reset button on the controller. For Castel systems with digital controllers, navigate to the fault log and clear active alarms. Never reset without investigating the cause.

Where can I find Castel service manuals and documentation?

Official Castel service manuals are available through authorised distributors and the Castel technical support portal. AskWhiz provides instant AI-powered access to Castel troubleshooting information via WhatsApp — no manual hunting required.

Refrigeration

Castel error codes, decoded.

Look up any Castel fault code below. Each one is grounded in Castel's own service documentation — the meaning, the symptoms, the causes, and the steps to clear it.

By Octavian Ghindea

Co-founder & CTO · Reviewed August 2026

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Castel sits in our Refrigeration coverage. Every page here is transcribed from the manufacturer's manuals, not scraped from forums.

What error codes does Castel display?

Tap a code for the full breakdown — meaning, symptoms, causes, and fix steps.

Compressor overload — check motor current draw

High pressure fault — check condenser and refrigerant charge

Low pressure fault — check evaporator and expansion valve

Sensor fault — check temperature probe wiring

Oil failure — check oil level and pump pressure

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Common questions about Castel equipment

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