Honeywell Lyric: Fixing 'Command not sent' Error - Smart... | digitalhomefaults.org

Technical Background:

The Honeywell Lyric communicates with SmartThings via Wi-Fi (2.4 GHz band). Command transmission involves translating the user's request into a data packet, transmitting it to the Honeywell cloud, which then relays it to the thermostat. Failures can occur at any stage: SmartThings hub, home Wi-Fi network, Honeywell servers, or the thermostat's internal firmware.

Symptoms:

The Honeywell Lyric thermostat displays 'Command not sent' in the SmartThings app after a user attempts to adjust the temperature. The Lyric thermostat LED may blink red, indicating a communication error. Check the SmartThings app event logs for detailed error messages.

Possible Causes:

Weak Wi-Fi signal (RSSI below -70 dBm) at the thermostat location.
Interference on the 2.4 GHz band from other devices (microwave, cordless phones).
Lyric thermostat firmware out of date.
SmartThings hub experiencing connectivity issues (check hub status).
Intermittent issues with Honeywell's cloud servers.
Incompatible device handler or SmartApp in SmartThings (corrupted code).

Solution:

1

Verify Wi-Fi signal strength at the thermostat using a Wi-Fi analyzer app on your smartphone (e.g., NetSpot). Ensure RSSI is above -70 dBm.
2

Reboot the SmartThings hub. Unplug the power adapter for 30 seconds, then plug it back in. Monitor the hub's LED indicator for normal operation.
3

Update the Lyric thermostat firmware. Navigate to the device settings in the SmartThings app and check for available updates. Follow on-screen instructions.
4

Check the SmartThings IDE (Integrated Development Environment) for outdated or conflicting Device Handlers. Remove any custom device handlers and switch back to the stock Honeywell Lyric device handler if applicable. Requires SmartThings account login on a PC.
5

Check the Honeywell cloud service status page to verify there are no ongoing outages.
6

If using a custom SmartApp for climate control, temporarily disable it to see if it resolves the issue.
7

As a last resort, remove the Lyric thermostat from SmartThings and re-pair it. Follow the SmartThings app's device addition instructions.

Safety Warning:

Ensure the power to the HVAC system is OFF at the breaker before performing any wiring modifications or thermostat removal. If you are uncomfortable working with electrical wiring, consult a qualified electrician.

Prevention:

- Schedule regular firmware updates for both the SmartThings hub and the Honeywell Lyric thermostat. - Monitor the Wi-Fi signal strength at the thermostat location periodically. - Avoid placing the SmartThings hub near devices that cause interference (microwaves, cordless phones). - Consider using a Wi-Fi extender or mesh network to improve Wi-Fi coverage throughout the house, especially in areas with weak signal.

Expert Tip:

For faster troubleshooting, try using the SmartThings app on a different mobile device to rule out app-specific issues. Also, check the SmartThings community forums for known issues with the Honeywell Lyric device handler.

Frequently Asked Questions

•What is the typical Wi-Fi range for the Honeywell Lyric thermostat?

The Honeywell Lyric typically operates on the 2.4 GHz band with a range of approximately 30-50 feet indoors, depending on wall construction and interference.

•How do I check the firmware version of my Honeywell Lyric thermostat?

The firmware version can usually be found within the thermostat's settings menu, accessible through the SmartThings app or directly on the thermostat's display. Specific steps may vary depending on the model.

•What type of batteries does the Honeywell Lyric thermostat use, and how often should they be replaced?

The Honeywell Lyric thermostat typically uses standard AA or AAA alkaline batteries. The replacement frequency depends on usage, but it's generally recommended to replace them annually or when the low battery indicator appears, especially before the Canadian winter.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

Frequently Asked Questions

•What is the typical Wi-Fi range for the Honeywell Lyric thermostat?

•How do I check the firmware version of my Honeywell Lyric thermostat?

•What type of batteries does the Honeywell Lyric thermostat use, and how often should they be replaced?

Related Questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: