What It Means
- Restricted air flow in cooling or continuous fan mode is lower than cfm setting.
Lennox Ducted Heating
Lennox Ducted Heating Error Code E312
Ducted Heating:
Causes & actions from Lennox
How it shows
- Integrated control 7-segment display: E312
Restricted airflow - Indoor blower is running at a reduced cubic feet per minute (Cutback Mode) - The variable speed motor has pre-set speed and torque limiters to protect the motor from damage caused by operating out of its designed parameters (0 to 0.8 inches water column total external static pressure). Check filter and ductwork. To clear replace filter if needed or repair/ add ductwork.
Other manual wording (1 of 2)
SLP98UHV
Restricted airflow − Indoor blower is running at a reduced cubic feet per minute (Cutback Mode) − The variable speed motor has pre−set speed and torque limiters to protect the motor from damage caused by operating out of its designed parameters (0 to 0.8 inches water column total external static pressure). Check filter and ductwork. To clear re- place filter if needed or repair/ add ductwork.
Other manual wording (2 of 2)
SL297UHNV
Warning Only. Restricted airflow - Indoor blower is running at a re- duced CFM (Cutback Mode - The variable speed motor has pre-set speed and torque limiters to protect the motor from damage caused by operating outside of design parameters (0 to 0.8” W.C.. total ex- ternal static pressure). Check filter and duct system. To clear, re- place filter if needed or repair/add duct. Cleared after the current service demand is satisfied.
Applicable models & manual sources
- SLP99UHV
Restricted air flow in cooling or continuous fan mode is lower than cfm setting.
- SLP98UHV
Restricted air flow in cooling or continuous fan mode is lower than cfm setting.
- SL297UHNV
Restricted air flow in cooling or continu- ous fan mode is lower than cfm setting.
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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