Lennox Ducted Heating

Lennox Ducted Heating Error Code d

Ducted Heating

d means different things on different Ducted Heating models. Enter your model number to see only your reading, or find your model below.

What It Means

  • Dehumidification mode (1 second ON) / 1 second OFF) / cfm setting displayed / Pause / Repeat Codes).
  • Dehumidification mode (1 second ON, 1 second OFF) / Pause / Repeat Codes).
  • SLP99UHV: Cooling stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm setting displayed / Pause / Repeat codes).

Causes & actions from Lennox

Dehumidification mode (1 second ON) / 1 second OFF) / cfm setting displayed / Pause / Repeat Codes).

15 models

EL280UHEK, EL280UHEK(X), EL297UHEK, ML296UHVK, ML297UH045XV36BK, ML297UH070XV36BK, ML297UH090XV36CK, ML297UH090XV60CK, ML297UH110XV60CK, ML297UH135XV60DK, ML297UHVK, SL280DFNV, SL280UHV, SL297UHNV, SLP98UHV

Gas furnace (indoor)

How it shows
  • Integrated control 7-segment display: d

This manual entry does not list further causes or actions.

Applicable models & manual sources
  • EL280UHEK

    Dehumidification mode (1 second ON) / 1 second OFF) / cfm setting displayed / Pause / Repeat Codes).

    EL280UHEK, EL280UHEK(X)

    EL280UHEK manual, page 10

  • EL297UHEK

    Dehumidification mode (1 second ON) / 1 second OFF) / cfm setting displayed / Pause / Repeat Codes).

    EL297UHEK manual, page 11

  • ML296UHVK

    Dehumidification mode (1 second ON) / 1 second OFF) / cfm setting displayed / Pause / Repeat Codes).

    ML296UHVK manual, page 44

  • ML297UH045XV36BK

    Dehumidification mode (1 second ON) / 1 second OFF) / cfm setting displayed / Pause / Repeat Codes).

    ML297UH045XV36BK, ML297UH070XV36BK, ML297UH090XV36CK, ML297UH090XV60CK, ML297UH110XV60CK, ML297UH135XV60DK, ML297UHVK

    ML297UH045XV36BK manual, page 45

  • SL280DFNV

    Dehumidification mode (1 second ON) / 1 second OFF) / cfm setting displayed / Pause / Repeat Codes).

    SL280DFNV manual, page 45

  • SL280UHV

    Dehumidification mode (1 second ON) / 1 second OFF) / cfm setting displayed / Pause / Repeat Codes).

    SL280UHV manual, page 52

  • SL297UHNV

    Dehumidification mode (1 second ON) / 1 second OFF) / cfm setting displayed / Pause / Repeat Codes).

    SL297UHNV manual, page 55

  • SLP98UHV

    Dehumidification mode (1 second ON) / 1 second OFF) / cfm setting displayed / Pause / Repeat Codes).

    SLP98UHV manual, page 62

Dehumidification mode (1 second ON, 1 second OFF) / Pause / Repeat Codes).

9 models

EL195UHNEK, EL195UHNEK-01, EL195UHNEK-02, EL196UHEK, EL280UHE(X), EL296UHE, ML180UHVK, ML193DFEK, ML196UHEK

Gas furnace (indoor)

How it shows
  • Integrated control 7-segment display: d

This manual entry does not list further causes or actions.

Applicable models & manual sources

Cooling stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm setting displayed / Pause / Repeat codes).

Models: SLP99UHV

How it shows
  • Integrated control 7-segment display: d

This manual entry does not list further causes or actions.

Applicable models & manual sources
  • SLP99UHV

    Cooling stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm setting displayed / Pause / Repeat codes).

    SLP99UHV manual, page 30

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

What should you check next?

Continue in ACLogics with guided diagnosis for your equipment and symptoms.

Download on the App Store Get it on Google Play
Scan to install on your phone Free · iPhone & Android
See how guided diagnosis works →