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[8]

Error 8 — Discharge temperature too high protection

Lennox · EL18KSLV Series Outdoor Units

What does [8] mean?

The compressor discharge temperature has exceeded 115°C. The error should clear within 3 minutes if the temperature drops below this threshold.

Common Causes

  • The discharge temperature sensor is faulty or poorly connected.
  • The system is blocked or clogged.
  • The system is low on refrigerant.
  • A valve is not opening correctly.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check if the sensor wiring is firmly in place.

  2. 2

    Verify the sensor's resistance is within the expected range.

  3. 3

    Check if the system is clogged and clean the piping system if necessary.

  4. 4

    Ensure the stop valve is open.

  5. 5

    Charge the system with refrigerant if it's low.

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 72)Search more codes in this manual