What It Means
- Low pressure switch failed open.
- Pressure switch failed open.
- SLP98UHV, SLP99UHV: Low pressure switch failed open - Refer to troubleshooting in installation instruction.
Lennox Ducted Heating
Lennox Error Code E223
Ducted Heating
E223 means different things on different Ducted Heating models. Enter your model number to see only your reading, or find your model below.
Causes & actions from Lennox
Low pressure switch failed open.
16 models
EL280UHE(X), EL280UHEK, EL280UHEK(X), EL296UHE, EL297UHEK, ML296UHVK, ML297UH045XV36BK, ML297UH070XV36BK, ML297UH090XV36CK, ML297UH090XV60CK, ML297UH110XV60CK, ML297UH135XV60DK, ML297UHVK, SL280DFNV, SL280UHV, SL297UHNV
Gas furnace (indoor)
How it shows
- Integrated control 7-segment display: E223
Check pressure (inches w.c.) of low pressure switch clos- ing on heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct opera- tion and restriction. Resumes normal operation after fault is cleared
Other manual wording (1 of 2)
SL280DFNV, SL280UHV, SL297UHNV
Check pressure (inches w.c.) of low pressure switch closing on heat call. Measure operating pressure (inch- es w.c.). Inspect vent and combustion air inducer for correct operation and restriction. Resumes normal op- eration after fault is cleared
Other manual wording (2 of 2)
EL280UHE(X), EL296UHE
Check pressure (inches w.c.) of low pressure switch closing on heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. Resumes normal operation after fault is cleared.
Applicable models & manual sources
- EL280UHEK
Low pressure switch failed open.
EL280UHEK, EL280UHEK(X)
- EL297UHEK
Low pressure switch failed open.
- ML296UHVK
Low pressure switch failed open.
- ML297UH045XV36BK
Low pressure switch failed open.
ML297UH045XV36BK, ML297UH070XV36BK, ML297UH090XV36CK, ML297UH090XV60CK, ML297UH110XV60CK, ML297UH135XV60DK, ML297UHVK
- SL280DFNV
Low pressure switch failed open.
- SL280UHV
Low pressure switch failed open.
- SL297UHNV
Low pressure switch failed open.
- EL280UHE(X)
Low pressure switch failed open.
- EL296UHE
Low pressure switch failed open.
Pressure switch failed open.
8 models
EL180UHNE(K), EL195UHNEK, EL195UHNEK-01, EL195UHNEK-02, EL196UHEK, ML180UHVK, ML193DFEK, ML196UHEK
Gas furnace (indoor)
How it shows
- Integrated control 7-segment display: E223
Check pressure (inches w.c.) of pressure switch closing on heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. Resumes normal operation after fault is cleared.
Applicable models & manual sources
- EL180UHNE(K)
Pressure switch failed open.
- EL195UHNEK
Pressure switch failed open.
EL195UHNEK, EL195UHNEK-01, EL195UHNEK-02
- EL196UHEK
Pressure switch failed open.
- ML180UHVK
Pressure switch failed open.
- ML193DFEK
Pressure switch failed open.
- ML196UHEK
Pressure switch failed open.
- ML196UHEK
Pressure switch failed open.
Low pressure switch failed open - Refer to troubleshooting in installation instruction.
Models: SLP98UHV, SLP99UHV
How it shows
- Integrated control 7-segment display: E223
Check inches of water column pressure during operation of low pressure switch on heat call, measure inches of water column of operating pressure, inspect vent and com- bustion air inducer for correct operation and restriction.
Other manual wording
SLP99UHV
Check inches of water column pressure during operation of low pressure switch on heat call, measure inches of water column of operating pressure, inspect vent and combustion air inducer for correct operation and restriction.
Applicable models & manual sources
- SLP98UHV
Low pressure switch failed open − Refer to troubleshooting in installation instruc- tion.
- SLP99UHV
Low pressure switch failed open - Refer to troubleshooting in installation instruction.
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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