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Green Heartbeat Slow Flash

Heartbeat LED - Green Slow Flash

Lennox · PRODIGY 2.0 Unit Controller

What does Green Heartbeat Slow Flash mean?

The Heartbeat LED is flashing slowly, indicating normal operation of the unit.

Common Causes

  • Normal system operation

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    This is an expected status indicator.

  2. 2

    If other issues arise, check other system indicators or error codes.

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