What It Means
- Dual-fuel furnace use lock-in
Lennox Zone controller
Lennox Error Code 0111
Zone controller
Causes & actions from Lennox
How it shows
- harmony diagnostic led1234: 0111 (led1: off, led2: on, led3: on, led4: on)
Heat pump was not able to maintain desired discharge air temperature; furnace will be used to satisfy heat calls for the next three hours. After three hours, the heat pump will be used again.
Applicable models & manual sources
- HARMONY III
Dual-fuel furnace use lock-in
HARMONY III, X9953
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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