Lennox is a major North American HVAC manufacturer focused on residential and light-commercial systems including the iComfort thermostat platform. HVAC API support for Lennox is planned and currently scoped against the Lennox S30 cloud API and standard BACnet/Modbus gateways.
HVAC · planned
Lennox
BACnetModbusREST
Device families
-
iComfort Thermostats
2 endpoints
-
Rooftop Units
1 endpoint
Endpoints & snippets
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iComfort Thermostats
- GET /v1/devices/{id}/temperature
- POST /v1/devices/{id}/setpoint
Rooftop Units
- GET /v1/devices/{id}/state
Fault codes & error codes
9 codes documented for Lennox. Confirm against your model's service manual — some codes vary between product lines (VRV vs. Sky Air vs. residential split, etc.).
9
| Code | Meaning | Severity |
|---|---|---|
| 223 | High-pressure switch trip Ask AI to troubleshoot → | critical |
| 224 | Low-pressure switch trip Ask AI to troubleshoot → | critical |
| 411 | Limit circuit open — high-temperature or rollout switch tripped Ask AI to troubleshoot → | critical |
| 412 | Flame rollout switch open Ask AI to troubleshoot → | critical |
| 431 | Inducer or pressure-switch fault (draft proving failure) Ask AI to troubleshoot → | critical |
| 433 | Ignition lockout — flame not established after retries Ask AI to troubleshoot → | critical |
| E1 | Communication error between thermostat and air handler or furnace Ask AI to troubleshoot → | critical |
| E2 | Communication error between thermostat and outdoor unit Ask AI to troubleshoot → | critical |
| E3 | Duplicate unit address detected on communicating bus Ask AI to troubleshoot → | warning |
No codes match — try a different search term or open the brand's service manual.