Sections in this Manual
- Connecting to your Wi-Fi network
- Registering your thermostat online
- Setting the clock
- Setting the fan
- Selecting system mode
- Adjusting program schedules
- Overriding schedules temporarily
- Overriding schedules permanently
- Setting vacation hold
- Setting filter reminder intervals
- Cleaning the screen
- Unregistering thermostat
- Disconnecting Wi-Fi
- Smart Response Technology
- Compressor protection
- Auto changeover
- Setting functions and options
- System setup
- FAQs
- Troubleshooting
- Glossary
- Regulatory information
- 1-year limited warranty
Troubleshooting
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is blank
- Check circuit breaker and reset if necessary.
- Make sure power switch at heating and cooling system is on.
- Make sure furnace door is closed securely.
- Make sure C wire is connected (see page 15).
Cannot change system setting to Cool
- Check Function 0170: System Type to make sure it is set to match your heating and cooling equipment (see page 54).
Fan does not turn on when heat is required
- Check Function 0180: Heating Fan Control to make sure it is set to match your heating equipment (see page 55).
“Wait” appears on the screen
- Compressor protection feature is engaged. Wait 5 minutes for the system to restart safely, without damage to the compressor.
Heat pump issues cool air in heat mode, or warm air in cool mode
- Check Function 0190: Heat Pump Changeover Valve to make sure it is properly configured for your system (see page 55).
Button on lower right of screen is blank
- This button will remain blank unless the furnace filter change reminder is activated (see page 44).
Red light is on
- If thermostat is in Emergency Heat mode the red light is normal. It shows that the thermostat is in emergency heat mode.
- If thermostat is not in Emergency Heat mode, contact a qualified service contractor for repair.
Heating or cooling system does not respond
- Press SYSTEM to set system to Heat. Make sure the temperature is set higher than the Inside temperature.
- Press SYSTEM to set system to Cool. Make sure the temperature is set lower than the Inside temperature.
- Check circuit breaker and reset if necessary.
- Make sure power switch at heating & cooling system is on.
- Make sure furnace door is closed securely.
- If “Wait” is displayed, the compressor protection timer is on. Wait 5 minutes for the system to restart safely, without damaging the compressor (see page 48).
Heating system is running in cool mode
- Check Function 0170: System Type to make sure it is set to match your heating and cooling equipment (see page 54).
Glossary
C wire
The “C” or common wire brings 24 VAC power to the thermostat from the heating/cooling system. Some older mechanical or battery operated thermostats may not have this wire connection. It is necessary for establishing a Wi-Fi connection to your home network.
Heat Pump heating/cooling system
Heat pumps are used to heat and cool a home. If your old thermostat has a setting for auxiliary or emergency heat, you likely have a heat pump.
Conventional heating/cooling system
Non–heat pump type systems; these include air handlers, furnaces or boilers that run on natural gas, oil or electricity. They may or may not include an air conditioner.
Jumper
A small piece of wire that connects two terminals together.
MAC ID, MAC CRC
Alphanumeric codes that uniquely identify your thermostat.
QR Code®
Quick response code. A two-dimensional, machine-readable image. Your wireless device can read the black and white pattern in the square and link its browser directly to a web site. QR Code is a registered trademark of DENSO WAVE INCORPORATED.
