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 blankCheck 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 respondPress 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 changeMake 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 flashingCompressor protection feature is engaged. Wait 5 minutes for the system to restart safely, without damage to the compressor

Lyric T5 Wi-Fi Thermostat Troubleshooting

NumberAlert/ReminderRecommended action
164Heat Pump Needs ServiceContact your heating or cooling professional to diagnose and service the heat pump.
168Wi-Fi Radio ErrorThe wireless module isn’t operating, and wireless features aren’t available. Contact Lyric Technical Support
170Internal Memory ErrorThe thermostat’s memory has encountered an error. Contact Lyric Technical Support
171Set the Date and TimePlease set the time and date on the thermostat to ensure features like scheduling can operate.
173Thermostat Temperature Sensor ErrorThe temperature sensor on the thermostat has encountered an error. Contact Lyric Technical Support
175AC Power ResumedAC power to the thermostat has been restored after power loss. You don’t need to take any action.
181Replace 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.
182Replace 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.
184Replace Humidifier PadReplace the humidifier pad or contact your heating or cooling professional. Reset the timer by touching Dismiss on the thermostat screen after replacement.
185Replace Dehumidifier FilterReplace the dehumidifier filter or contact your heating or cooling professional. Reset the timer by touching Dismiss on the thermostat screen after replacement.
187Clean or Replace Ventilator FilterClean 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.
188Replace 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.
189Replace UV Bulb (2)
210Register Online For Outdoor TemperatureYou 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.
388Register Online for Remote Access and Outdoor TemperatureYou need to register online for remote thermostat access and outdoor temperature information. Please download the Lyric app and register your thermostat.
399No InternetThe internet connection has been lost. Please check your network settings.
400No Wi-Fi SignalThe Wi-Fi signal has been lost. Please wait for the thermostat to reconnect or select a new Wi-Fi network.
508Wi-Fi Not ConfiguredPlease download the Lyric app and follow the steps to connect your thermostat to Wi-Fi.

Lyric T6 Thermostat Troubleshooting

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