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26

2 red flashes, 6 green flashes — Compressor startup fail

Lennox · Communicating Systems

What does 26 mean?

The compressor is failing to start correctly. The system will stop the compressor and fan. If this happens 10 times within an hour, the system will lock out.

Common Causes

  • Compressor failed to start
  • Refrigerant issue
  • Outdoor control board failure
  • Inverter failure

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the system's refrigerant levels.

  2. 2

    Disconnect power to the outdoor unit and restart the system.

Browse all codes in this manual (41)
Verified technical data. Last updated: April 2026

Related Faults

14Inverter Flash Code 14 (Red 1 flash, Green 4 flashes) — OD Inverter Compressor Slowdown21Inverter Flash Code 21 (Red 2 flashes, Green 1 flash) — OD Inverter DC Peak Fault292 red flashes, 9 green flashes — Compressor over-current
Source: Lennox Communicating Systems
Open Manual (Page 59)Search more codes in this manual