HVACopedia

Lennox · Furnace

E334 Y1 relay stuck on control

High severity EL296UHVLennox SL280UHV

What the control is telling you

Y1 relay on the integrated control is stuck.

Applies to: EL296UHV(X) series furnaces (integrated control 103130-XX and 107045-XX)

Likely causes

  • Failed relay on integrated control

Test and repair steps

  1. Confirm Y1 output stays energized without demand.
  2. Replace the integrated control.

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Source: Lennox EL296UHV(X) Unit Information / Service Literature, Table 5 Ignition Control 103130-XX Diagnostic Codes, p.37; Ignition Control 107045-XX Diagnostic Codes table, p.44. Summarized in our own words; check the original manual for your model.

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For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.