Owner's Manual
Table Of Contents
- Installation Guide
- User Guide
- Table of Contents
- Thermostat Features
- Getting the most from the T9 Smart Thermostat
- Using Your Thermostat
- Using the Honeywell Home App
- Basic thermostat operation
- Wi-Fi settings and connectivity
- Scheduling options
- Advanced Features
- Frequently Asked Questions (FAQs)
- Troubleshooting
- Specifications
- Regulatory Information
- Warranty
- C-Wire Adapter Guide
- Wire Labels
- FCC Compliance Statement
16
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 for heating & cooling system is on.
• Make sure furnace door is closed securely.
• Make sure the C wire is connected.
Heating or
cooling system
does not
respond
• Press Menu > System Mode > Heat > Done to set the system
to Heat mode. Make sure the desired temperature is higher
than the indoor temperature.
• Press Menu > System Mode > Cool > Done to set the system
to Cool mode. Make sure the desired temperature is lower
than the indoor 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 desired temperature is within 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)
Aux heat runs in
cooling
• For heat pump systems, verify there is not a wire attached to
W on the UWP.
Cool runs with a
call for heat
• For heat pump systems, verify there is not a wire attached to
W the UWP.
The product should not be disposed of with other household waste. Check
for the nearest authorized collection centers or authorized recyclers.
The correct disposal of end-of-life equipment will help prevent potential
negative consequences for the environment and human health.