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68

Alarm 68 — Gas valve not detected as energized

Lennox · PRODIGY 2.0 Unit Controller

What does 68 mean?

This alarm code indicates that the unit controller did not detect the gas valve being energized within two minutes after a heating demand was initiated for gas heat section 2.

Common Causes

  • Gas valve for section 2 is not receiving power.
  • Faulty gas valve for section 2.
  • Wiring issue to the gas valve for section 2.
  • Heating demand signal is not being correctly sent or received for section 2.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure there is a valid heating demand for section 2.

  2. 2

    Check the wiring to the gas valve for section 2.

  3. 3

    Verify that the gas valve for section 2 is receiving power.

  4. 4

    Test the gas valve for section 2 for proper operation.

  5. 5

    Contact a technician if the issue persists.

Browse all codes in this manual (56)
Verified technical data. Last updated: April 2026

Related Faults

12Alarm 12 - High Pressure Switch S414Alarm 14 - High Pressure Switch S716Alarm 16 - High Pressure Switch S28
Source: Lennox PRODIGY 2.0 Unit Controller
Open Manual (Page 13)Search more codes in this manual