Randell CON Error Code

What does Randell CON mean?

On a Randell prep table with the Danfoss controller, CON is the Condenser Temperature High Limit alarm. It means the condenser has reached a temperature above its allowed limit, typically because the coil is dirty or airflow is blocked, so the high side of the refrigeration system cannot reject heat properly and cooling performance drops.

Symptoms

• Display shows CON with the alarm LED lit
• Condenser coil is dirty or has objects obstructing airflow
• Machine compartment runs hot
• Cabinet has difficulty holding its set point

Common causes

• Dirty condenser coil restricting airflow
• Objects obstructing airflow through the condenser
• Inadequate ventilation or nearby heat sources
• Condenser fan not moving enough air

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Diagnostic steps

1. Confirm the alarm

   Verify the Danfoss display reads CON, the Condenser Temperature High Limit alarm.

2. Disconnect power before servicing

   Ensure the unit is disconnected from its power source before cleaning or inspecting the condenser, per the manual.

3. Clean the condenser coil

   The Danfoss table directs you to clean the condenser coil; brush in the direction of the fins so airflow and heat transfer are restored.

4. Inspect for obstructions

   The table also directs inspecting the coil for any objects obstructing airflow, and removing them.

5. Contact service if it persists

   If CON stays on after cleaning and clearing obstructions, the table directs contacting service; call 888-994-7636.

When to call a professional

Cleaning the condenser and clearing obstructions are owner tasks, but the Danfoss code table itself ends with contacting service if the alarm continues. Call a Randell Authorized Service Agent when CON persists, when the condenser fan is not running, or when a refrigeration fault is suspected. The manual requires factory-authorized service with OEM parts on these R290 units; reach service at 888-994-7636.