What It Means
- High pressure switch failed closed
- SLP98UHV, SLP99UHV: High pressure switch failed closed - Refer to troubleshooting in installation instruction.
Lennox Ducted Heating
Lennox Error Code E226
Ducted Heating
E226 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
High pressure switch failed closed
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: E226
Check operation of high 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
- EL280UHE(X)
High pressure switch failed closed.
- EL280UHEK
High pressure switch failed closed
EL280UHEK, EL280UHEK(X)
- EL296UHE
High pressure switch failed closed.
- EL297UHEK
High pressure switch failed closed
- ML296UHVK
High pressure switch failed closed
- ML297UH045XV36BK
High pressure switch failed closed
ML297UH045XV36BK, ML297UH070XV36BK, ML297UH090XV36CK, ML297UH090XV60CK, ML297UH110XV60CK, ML297UH135XV60DK, ML297UHVK
- SL280DFNV
High pressure switch failed closed
- SL280UHV
High pressure switch failed closed
- SL297UHNV
High pressure switch failed closed
High pressure switch failed closed - Refer to troubleshooting in installation instruction.
Models: SLP98UHV, SLP99UHV
How it shows
- Integrated control 7-segment display: E226
Check high pressure switch for closed contacts, measure inches of water column of operating pressure, inspect vent and combustion air inducer for correct operation and re- striction.
Other manual wording
SLP99UHV
Check high pressure switch for closed contacts, measure inches of water column of operating pressure, inspect vent and combustion air inducer for correct operation and restriction.
Applicable models & manual sources
- SLP98UHV
High pressure switch failed closed − Refer to troubleshooting in installation instruc- tion.
- SLP99UHV
High pressure switch failed closed - 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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Continue in ACLogics with guided diagnosis for your equipment and symptoms.
