What It Means
- Insufficient cooling
Lennox Zone controller
Lennox Error Code 1000
Zone controller
Causes & actions from Lennox
How it shows
- harmony diagnostic led1234: 1000 (led1: on, led2: off, led3: off, led4: off)
Occurs when there is a call for cooling and the Discharge Air Sensor does not sense a decrease in supply air temperature indicating the cooling is not functioning properly.
Applicable models & manual sources
- HARMONY III
Insufficient cooling
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.
What should you check next?
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