What It Means
- High pressure switch failed open.
- SLP98UHV, SLP99UHV: High pressure switch failed open - Refer to troubleshooting in installation instruction.
Lennox Ducted Heating
Lennox Error Code E225
Ducted Heating
E225 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 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: E225
Check pressure (inches w.c.) of high 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 high 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 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
- EL280UHEK
High pressure switch failed open.
EL280UHEK, EL280UHEK(X)
- EL297UHEK
High pressure switch failed open.
- ML296UHVK
High pressure switch failed open.
- ML297UH045XV36BK
High pressure switch failed open.
ML297UH045XV36BK, ML297UH070XV36BK, ML297UH090XV36CK, ML297UH090XV60CK, ML297UH110XV60CK, ML297UH135XV60DK, ML297UHVK
- SL280DFNV
High pressure switch failed open.
- SL280UHV
High pressure switch failed open.
- SL297UHNV
High pressure switch failed open.
- EL280UHE(X)
High pressure switch failed open.
- EL296UHE
High pressure switch failed open.
High pressure switch failed open - Refer to troubleshooting in installation instruction.
Models: SLP98UHV, SLP99UHV
How it shows
- Integrated control 7-segment display: E225
Check inches of water column pressure of high pressure switch on heat call, measure inches of water column of operating pressure, inspect vent and combustion air induc- er for correct operation and restriction.
Other manual wording
SLP99UHV
Check inches of water column pressure of high 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
High pressure switch failed open − Refer to troubleshooting in installation instruc- tion.
- SLP99UHV
High 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.
What should you check next?
Continue in ACLogics with guided diagnosis for your equipment and symptoms.
