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Dr. Charlene MasonSep 12, 2025
Why Lennox ComfortSense L5711U fan does not turn on in heat mode?
- Jjennifer44Sep 12, 2025
Verify Installer Set?Up 0180: Fan Control in Heating*. Ensure the Electric Heat option is selected.
Why Lennox ComfortSense L5711U fan does not turn on in heat mode?
Verify Installer Set?Up 0180: Fan Control in Heating*. Ensure the Electric Heat option is selected.
What does red LED light mean on Lennox ComfortSense L5711U?
A system monitor is connected to the thermostat's L terminal. Refer to the 'Heating or Cooling System Does Not Turn On' sections for troubleshooting suggestions.
General| Category | Thermostat |
|---|---|
| Model | ComfortSense L5711U |
| Display Type | Touchscreen |
| Wi-Fi Connectivity | Yes |
| Power Source | 24V AC |
| Temperature Range | 40°F to 99°F |
| Humidity Control | Yes |
| Scheduling | 7-day programmable |
| Backup Battery | No |
| Type | Smart |
| Compatibility | Works with most HVAC systems |
| Stages | 2 heat / 2 cool |
| Warranty | 5 years |
Large, clear display with backlight shows current temperature, setting, and time even in dark.
Menu-driven programming makes set-up effortless via touch screen interaction.
Real-time clock maintains time during power failures and auto-converts to daylight savings time.
"Saving Changes" notification assures users that changes have been saved correctly.
Reminders notify users of needed maintenance like filter, UV lamp, or battery replacement.
Defines four daily schedule periods: Wake, Leave, Return, and Sleep for comfort and energy saving.
Details ON (continuous), AUTO (system on), and CIRC (random) fan operation modes.
Instructions on how to reset reminder timers for filter, humidifier, or UV lamp after replacement.
How to view and modify timer settings and reload values before they expire.
Locks most keys but allows temperature adjustment; temporary changes last until next schedule.
Locks all keys except access to user set-up options via SYSTEM key.
