What It Means
- Reversed line voltage polarity (control will restart if the error recovers).
Lennox Ducted Heating
Lennox Error Code 5 + 4
Ducted Heating:
Causes & actions from Lennox
How it shows
- ignition control red led: 5 + 4
This manual entry does not list further causes or actions.
Applicable models & manual sources
- G60UHV(X)
Reversed line voltage polarity (control will restart if the error recovers).
- G61MPV
Reversed line voltage polarity (control will restart if the error recovers).
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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