What It Means
- SL280DFNV, SL280UHV, SL297UHNV: Outdoor air temperature sensor failure. Only shown if shorted or out-ofrange.
- SLP98UHV, SLP99UHV: Outdoor air sensor failure - NO error if disconnected. Only shown if shorted or out-of-range.
Lennox Ducted Heating
Lennox Ducted Heating Error Code E180
Ducted Heating
E180 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
Outdoor air temperature sensor failure. Only shown if shorted or out-ofrange.
Models: SL280DFNV, SL280UHV, SL297UHNV
How it shows
- Integrated control 7-segment display: E180
Compare outdoor sensor resistance to temperature/ resis- tance charts in unit installation instructions. Replace sensor pack if necessary. At beginning of (any) configuration, furnace or air handler control will sense outdoor air and discharge air temperature sensor(s). If detected (reading in range), appropriate feature will be set as ‘installed’ and that could be seen in ‘About’ screen. In normal operation after control recognizes sensors, alarm will be sent if valid temperature reading is lost. To get rid of setting and alarm, redo configu- ration and make sure that temperature sensor is marked as ‘not installed’ in Indoor Unit ‘About’ screen. When Indoor unit control is replaced, thermostat will ‘tell’ new control if tem- perature sensor is in system or not. Clears 30 seconds after fault recovered.
Applicable models & manual sources
- SL280DFNV
Outdoor air temperature sensor failure. Only shown if shorted or out-ofrange.
- SL280UHV
Outdoor air temperature sensor failure. Only shown if shorted or out-ofrange.
- SL297UHNV
Outdoor air temperature sensor failure. Only shown if shorted or out-ofrange.
Outdoor air sensor failure - NO error if disconnected. Only shown if shorted or out-of-range.
Models: SLP98UHV, SLP99UHV
How it shows
- Integrated control 7-segment display: E180
Compare outdoor sensor resistance to temperature resistance charts in installation instructions. Replace if necessary.
Other manual wording
SLP99UHV
This manual entry does not list further causes or actions.
Applicable models & manual sources
- SLP98UHV
Outdoor air sensor failure − NO error if disconnected. Only shown if shorted or out−of−range.
- SLP99UHV
Outdoor air sensor failure - NO error if disconnected. Only shown if shorted or out-of-range.
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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