Symptoms
Something on the thermostat screen, or the way the system is behaving, and what it means.
- "EM Heat" is on your thermostat: why and what to do
Why does my thermostat say emergency heat?
- AC never stops running: is it the thermostat?
Why does my AC run all the time?
- AC turns on and off every few minutes: what the thermostat controls
Why does my AC keep turning on and off?
- Amazon Smart Thermostat display lights: what each one means
What do the lights on my Amazon Smart Thermostat mean?
- Amazon Smart Thermostat not responding to Alexa
Why is my Amazon Smart Thermostat not responding to Alexa?
- Carrier Infinity "System Check in Progress"
What does "System Check in Progress" mean on a Carrier Infinity control?
- Carrier thermostat service reminder
Why does my Carrier thermostat show a service reminder?
- ecobee says "Calibrating"
Why does my ecobee say "Calibrating"?
- ecobee shows a different temperature than the room you are in
Why does my ecobee show a different temperature than my room?
- ecobee Smart Away turns on by itself
Why does my ecobee switch to Away when I am home?
- Fan keeps running when the system is off
Why does my fan keep running when the thermostat is off?
- Heat pump blowing cool air while the thermostat says heat
Why is cool air coming out when my thermostat is set to heat?
- Honeywell Home thermostat error codes
What do the error codes on a Honeywell Home thermostat mean?
- House temperature swings between heating or cooling cycles
Why does my house temperature swing up and down?
- Nest "No power to Rh wire" message
What does "No power to Rh wire" mean on a Nest thermostat?
- Nest Eco mode turns on by itself
Why does my Nest thermostat switch to Eco on its own?
- Nest thermostat flashing red light
What does a flashing red light on a Nest thermostat mean?
- Nest thermostat low battery warning
Why does my Nest thermostat say the battery is low?
- Nest thermostat says "Delayed"
Why does my Nest thermostat say "Delayed"?
- Sensi thermostat flashing snowflake or flame icon
What does a flashing snowflake or flame mean on a Sensi thermostat?
- Sensi thermostat says "Limit"
Why does my Sensi thermostat say "Limit"?
- Thermostat "Filter" reminder: what it means and how to clear it
Why does my thermostat say to change the filter?
- Thermostat blinking "Cool On": what it means and how long it lasts
What does it mean when my thermostat is blinking "Cool On"?
- Thermostat clicks but the system does not start
Why does my thermostat click but nothing turns on?
- Thermostat humidity reading seems wrong
Why is the humidity on my thermostat different from my hygrometer?
- Thermostat is not following its schedule
Why is my thermostat not following its schedule?
- Thermostat low battery message
What does the low battery warning on my thermostat mean?
- Thermostat says "Cool On" but the AC is not running
Why does my thermostat say "Cool On" when the AC is not running?
- Thermostat says heat on but nothing happens
Why does my thermostat say heat on but nothing happens?
- Thermostat screen is blank
Why is my thermostat screen blank?
- Thermostat screen is locked
Why is my thermostat screen locked?
- Thermostat shows offline or Wi-Fi disconnected
Why does my smart thermostat keep going offline?
- Thermostat shows the wrong room temperature
Why does my thermostat show a different temperature than the room?
- Thermostat switches between heating and cooling on its own
Why does my thermostat switch between heat and cool by itself?
- Why the room never matches the set temperature
Why does my house never reach the temperature I set?
- Why your temperature change does not stick
Why does my thermostat keep going back to the schedule?
- Why your thermostat says "Wait"
Why does my thermostat say "Wait"?
- Why your thermostat shows AUX when it is not that cold
Why does my thermostat show AUX heat on a mild day?