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SERVICE Constant on

SERVICE LED - Constant On

Lennox · PRODIGY 2.0 Unit Controller

What does SERVICE Constant on mean?

The red SERVICE LED is solid on, indicating the node is configured but no application is currently loaded or running.

Common Causes

  • Node is configured
  • No application loaded or running on the node

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Load or start the required application on the node.

  2. 2

    Verify the application files are correct and compatible.

  3. 3

    Consult the system documentation for application loading procedures.

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