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Green Heartbeat Fast Flash

Heartbeat LED - Green Fast Flash

Lennox · PRODIGY 2.0 Unit Controller

What does Green Heartbeat Fast Flash mean?

The Heartbeat LED is flashing rapidly, indicating the unit is in bootloader or firmware update mode.

Common Causes

  • Firmware update in progress
  • Unit is in bootloader mode

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Do not interrupt the firmware update process.

  2. 2

    Wait for the update to complete; the LED should return to a slow flash.

  3. 3

    If the LED remains in fast flash after an extended period, consult the manual or support.

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