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D

Air Flow Proving Switch Disabled by M3 Unit Controller

Lennox · PRODIGY 2.0 Unit Controller

What does D mean?

Setting Configuration ID 2, Position 1 to 'D' means the M3 unit controller will not monitor the air flow switch (S52). This is typically used when S52 is physically connected to a DDC controller instead.

Common Causes

  • User intentionally disabling the feature.
  • Configuration setting was changed for integration with external controllers.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Navigate to SETUP > INSTALL > CONFIGURATION ID 2.

  2. 2

    Set Position 1 to 'D' to disable M3 unit controller monitoring of S52.

  3. 3

    Save the configuration changes.

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 14)Search more codes in this manual