Lyric Thermostat Troubleshooting

If you have problems with a Lyric Wi Fi thermostat, visit this page to find out how to fix them. Here, you can find Lyric thermostat troubleshooting manuals for different models. They enlist error codes, the most widespread technical problems, their reasons and instructions on how to fix the issues.

Lyric T6-Pro Thermostat Troubleshooting

Problem	Solution
Display is blank	Check circuit breaker and reset if necessary.
	Make sure power switch for heating & cooling system is on.
	Make sure furnace door is closed securely.
	Make sure fresh AA alkaline batteries are correctly installed (
Heating or cooling system does not respond	Press Mode button to set svstem Heat
	Make sure the desired temperature is set higher than the inside temperature.
	Press Mode button to set system Cool
	Make sure the desired temperature is set lower than the inside temperature.
	Check circuit breaker and reset if necessary.
	Make sure power switch for heating & cooling system is on.
	Make sure furnace door is closed securely.
	Wait 5 minutes for the system to respond.
Temperature settings do not change	Make sure heating and cooling temperatures are set to acceptable ranges:
	Heat: 40 °F to 90 °F (4.5 °C to 32.0 °C)
	Cool: 50 °F to 99 °F (10.0 °C to 37.0 °C)
“Cool On” or “HeatOn” is flashing	Compressor protection feature is engaged. Wait 5 minutes for the system to restart safely, without damage to the compressor

Lyric T5 Wi-Fi Thermostat Troubleshooting

Number	Alert/Reminder	Recommended action
164	Heat Pump Needs Service	Contact your heating or cooling professional to diagnose and service the heat pump.
168	Wi-Fi Radio Error	The wireless module isn’t operating, and wireless features aren’t available. Contact Lyric Technical Support
170	Internal Memory Error	The thermostat’s memory has encountered an error. Contact Lyric Technical Support
171	Set the Date and Time	Please set the time and date on the thermostat to ensure features like scheduling can operate.
173	Thermostat Temperature Sensor Error	The temperature sensor on the thermostat has encountered an error. Contact Lyric Technical Support
175	AC Power Resumed	AC power to the thermostat has been restored after power loss. You don’t need to take any action.
181	Replace Air Filter (1)	Replace the air filter or contact your heating or cooling professional. Reset the air filter timer by touching Dismiss on the thermostat screen after replacement.
182	Replace Air Filter (2)	Replace the air filter or contact your heating or cooling professional. Reset the timer by touching Dismiss on the thermostat screen after replacement.
184	Replace Humidifier Pad	Replace the humidifier pad or contact your heating or cooling professional. Reset the timer by touching Dismiss on the thermostat screen after replacement.
185	Replace Dehumidifier Filter	Replace the dehumidifier filter or contact your heating or cooling professional. Reset the timer by touching Dismiss on the thermostat screen after replacement.
187	Clean or Replace Ventilator Filter	Clean or replace the ventilator filter or contact your heating or cooling professional. Reset the timer by touching Dismiss on the thermostat screen after you’re done.
188	Replace UV Bulb (1)	Replace the UV bulb or contact your heating or cooling professional. Reset the timer by touching Dismiss on the thermostat screen after you’re done.
189	Replace UV Bulb (2)
210	Register Online For Outdoor Temperature	You need to register online to receive outdoor temperature information from the Internet. Based on the installation settings, this information is required for correct operation of your system. Please download the Lyric app and register your thermostat.
388	Register Online for Remote Access and Outdoor Temperature	You need to register online for remote thermostat access and outdoor temperature information. Please download the Lyric app and register your thermostat.
399	No Internet	The internet connection has been lost. Please check your network settings.
400	No Wi-Fi Signal	The Wi-Fi signal has been lost. Please wait for the thermostat to reconnect or select a new Wi-Fi network.
508	Wi-Fi Not Configured	Please download the Lyric app and follow the steps to connect your thermostat to Wi-Fi.

Lyric T6 Thermostat Troubleshooting

Error	Solution
WIFI RADIO ERROR	The Wi-Fi radio of your Thermostat is faulty, contact your installer
INTERNAL MEMORY ERROR	The internal memory of your Thermostat is faulty
THERMOSTAT TEMPERATURE SENSOR ERROR	The temperature sensor of your Thermostat is faulty
INDOOR TEMPERATURE SENSOR ERROR	The remote indoor temperature sensor is not connected or the wiring is faulty
OUTDOOR TEMPERATURE SENSOR ERROR	The remote outdoor temperature sensor is not connected or the wiring is faulty
REGISTER ONLINE	Please download the App, create an account and register your Thermostat
NO INTERNET	The internet connection has been lost, please check your internet connection or Wi-Fi router
NO WIFI SIGNAL	The Wi-Fi signal has been lost, please check your Wi-Fi router
WIFI NOT CONFIGURED	Please download the App, create an account and add your Thermostat
NO RECEIVER BOX BINDING	There is no Receiver box binding data stored
NO COMMUNICATION RECEIVER BOX	There is no communication with the Receiver box, move Thermostat closer
RF SIGNAL OFRECEIVER BOX LOW	There is a weak radio signal from the Receiver box, move Thermostat closer
BOILER FAULT XX	The boiler reported a failure number XX