What It Means
- SL280DFNV, SL297UHNV, SLP98UHV: LSOM - Compressor low voltage.
- SLP99UHV: LSOM - Compressor contactor is welded.
Lennox Ducted Heating
Lennox Ducted Heating Error Code E409
Ducted Heating
E409 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
LSOM - Compressor low voltage.
Models: SL280DFNV, SL297UHNV, SLP98UHV
How it shows
- Integrated control 7-segment display: E409
Secondary voltage is below 18VAC. After 10 minutes, oper- ation is discontinued. Clears the code after voltage is higher than 20 VAC for 2 seconds or after power reset.
Other manual wording
SLP98UHV
Replace contactor.
Applicable models & manual sources
- SL280DFNV
LSOM - Compressor low voltage.
- SL297UHNV
LSOM - Compressor low voltage.
- SLP98UHV
LSOM − Compressor low voltage.
LSOM - Compressor contactor is welded.
Models: SLP99UHV
How it shows
- Integrated control 7-segment display: E409
Replace contactor.
Applicable models & manual sources
- SLP99UHV
LSOM - Compressor contactor is welded.
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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