What are the common problems with Lennox thermostats including iComfort S30, iComfort E30, and ComfortSense 7500 include connectivity and sensor issues similar to other smart thermostats but with some Lennox-specific communicating errors. First, WiFi connectivity loss is most common, where iComfort S30 loses connection to Lennox cloud and shows offline, causing app not working and remote control failure, fix by rebooting router and thermostat by holding menu for 5 seconds, and ensuring strong WiFi signal within 30 feet. Second, blank screen or no display due to power loss from furnace, check furnace power switch on and breaker not tripped, as thermostat gets 24 volts from furnace control board, if board failed, thermostat blank. Third, temperature reading inaccurate by 2 to 5 degrees due to thermostat placed in draft or direct sunlight or internal sensor failed, causing short cycling. Fourth, communicating error codes like E1, E2, or E3 on iComfort that indicate communication failure between thermostat and indoor and outdoor units, often caused by loose wiring or control board failure costing 400 to 700 dollars. Fifth, short cycling where furnace turns on and off every 3 minutes due to thermostat anticipator setting wrong or wiring loose. Sixth, battery low warning for ComfortSense that uses batteries. Lennox thermostats are proprietary communicating, so replacement costs 300 to 700 dollars versus standard 100 to 250 dollars for Nest. Regular software updates via WiFi prevent many issues.
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