User Guide

28
Number Alert/Reminder Recommended action
178 Outdoor Temperature
Sensor Error
The wired outdoor temperature sensor is not connected
or there is a wiring short. Contact your heating or cooling
professional for assistance.
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.
183 Clean Humidifier Tank
and Replace Water
Filter
Clean humidifier tank and replace the water filter, or
contact dealer to do this for you. Reset the timer by
touching the Dismiss button on the thermostat screen
after it is replaced.
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.
186 Clean Ventilator Core Clean the ventilator core or contact your heating or
cooling professional. Reset the timer by touching Dismiss
on the thermostat screen after you’re done.
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) 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.
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
Honeywell Home 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 Honeywell Home 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.
See page 11 for WiFi reconnection instructions.
508 WiFi Not Configured Please download the Honeywell Home app and follow
the steps to connect your thermostat to WiFi. See page
11 for WiFi connection instructions.