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Sensor abnormal

Sensor abnormal — Pressure sensor malfunction

Lennox · EL18KSLV Series Outdoor Units

What does Sensor abnormal mean?

A pressure sensor has been detected as having an open or short circuit, indicating a malfunction.

Common Causes

  • Bad sensor connection.
  • The sensor itself is bad.
  • Sensor resistance drift.
  • Inaccurate pressure readings by the PCB.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the sensor wiring is firmly and correctly in place.

  2. 2

    Check if the sensor resistance is within the specified range.

  3. 3

    Verify that the pressure loop acquired by the computer board is normal.

  4. 4

    Replace the sensor if issues are found.

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 73)Search more codes in this manual