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46

Error 46 — Compressor driver module heat sink sensor abnormal

Lennox · EL18KSLV Series Outdoor Units

What does 46 mean?

The temperature sensor on the compressor driver module's heat sink is reporting an abnormal temperature, outside the range of -25°C to 150°C.

Common Causes

  • Compressor driver module heat sink sensor out of range
  • Loose sensor connection
  • Faulty sensor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the connection of the heat sink sensor to the compressor driver module.

  2. 2

    Inspect the sensor wiring for damage.

  3. 3

    Verify the sensor's temperature reading is within the expected range.

Browse all codes in this manual (43)
Verified technical data. Last updated: April 2026

Related Faults

1Error 1 — EEPROM malfunction or damage10Error 10 — Outdoor defrost sensor failure11Error 11 — Suction temperature sensor failure
Source: Lennox EL18KSLV Series Outdoor Units
Open Manual (Page 66)Search more codes in this manual