What It Means
- Simultaneous heat and cool call from same thermostat
Lennox Zone controller
Lennox Error Code 0001
Zone controller
Causes & actions from Lennox
How it shows
- harmony diagnostic led1234: 0001 (led1: off, led2: off, led3: off, led4: on)
In addition, possible inconsistent thermostat signals. Verify thermostats are correctly connected to the zone control panel. If error persists after you check the thermostats and jumper selections or try another thermostat model or brand. Demand will be ignored from the zone sending the bad signals. See “Table 14. Time Delays” on page 60.
Applicable models & manual sources
- HARMONY III
Simultaneous heat and cool call from same thermostat
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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