Honeywell Home T9 Smart Thermostat Guide D'installation page 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
Heating or
cooling system
does not
respond
Temperature
settings do not
change
Aux heat runs in
cooling
Cool runs with a
call for heat
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.
• 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.
• 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.
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)
• For heat pump systems, verify there is not a wire attached to
W on the UWP.
• For heat pump systems, verify there is not a wire attached to
W the UWP.
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