Lennox Split & Multi-Split

Lennox Error Code Alternating Slow FLASH

Split & Multi-Split

Alternating Slow FLASH means different things on different Split & Multi-Split models. Enter your model number to see only your reading, or find your model below.

What It Means

  • EL15XP1, ML14XP1: 5-min Anti-Short-Cycle Delay
  • 14HPX, XP14: Anti-short cycle lockout

Causes & actions from Lennox

5-min Anti-Short-Cycle Delay

Models: EL15XP1, ML14XP1

How it shows
  • cmc1 ds2 ds1 led: Alternating Slow FLASH (ds1: flashing (slow), ds2: flashing (slow))

This manual entry does not list further causes or actions.

Applicable models & manual sources

Anti-short cycle lockout

Models: 14HPX, XP14

Heat pump (outdoor)

How it shows
  • cmc1 ds2 ds1 led: Alternating Slow FLASH (ds1: flashing (slow), ds2: flashing (slow))

This manual entry does not list further causes or actions.

Applicable models & manual sources
Disclaimer: This information is for general reference. Code wording and instructions vary by model. Always follow the service manual for your exact unit.

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