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COOL + MAX OPEN ECON

Display Message - COOL + MAX OPEN ECON

Lennox · PRODIGY 2.0 Unit Controller

What does COOL + MAX OPEN ECON mean?

The system is operating in cooling mode, utilizing mechanical cooling along with maximum free cooling from the economizer with its damper fully open.

Common Causes

  • High cooling demand
  • Outdoor air is suitable for maximum free cooling

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    This is a normal operating mode when conditions allow.

  2. 2

    Verify economizer damper operation if cooling is insufficient.

Browse all codes in this manual (56)
Verified technical data. Last updated: April 2026

Related Faults

12Alarm 12 - High Pressure Switch S414Alarm 14 - High Pressure Switch S716Alarm 16 - High Pressure Switch S28
Source: Lennox PRODIGY 2.0 Unit Controller
Open Manual (Page 97)Search more codes in this manual