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430

Alert Code 430 — Compressor startup fail

Lennox · Communicating Systems

What does 430 mean?

The compressor is unable to start. Both the compressor and fan will stop. If this occurs frequently within an hour, the entire system will lock out.

Common Causes

  • Compressor start-up failure
  • Issues with refrigerant
  • Problems with the outdoor control board or inverter

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the system's refrigerant charge.

  2. 2

    Disconnect power to the outdoor unit and then reconnect to 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 Fault262 red flashes, 6 green flashes — Compressor startup fail
Source: Lennox Communicating Systems
Open Manual (Page 59)Search more codes in this manual