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442

Alert Code 442 — Compressor Top Cap Switch Strike Lockout

Lennox · Communicating Systems

What does 442 mean?

The outdoor unit is locked out because the compressor top cap switch has opened five times within one hour. This is due to the compressor's thermal protection sensor repeatedly opening.

Common Causes

  • Compressor thermal protection sensor opening multiple times

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Disconnect power to the outdoor unit.

  2. 2

    Wait for 30 seconds.

  3. 3

    Reconnect power to the outdoor unit 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 67)Search more codes in this manual