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Honeywell TH8321 - TROUBLESHOOTING COMMON ISSUES; Common Troubleshooting Scenarios

Honeywell TH8321
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VISIONPRO® 8000 SMART THERMOSTAT
33-00096—04 90
TROUBLESHOOTING
Table 10. Troubleshooting.
Symptom Action
Screen 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.
Screen is
difficult to read
Change screen brightness using Preferences menu.
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, an alert is active. Check message on the thermostat
screen.
Heating or
cooling system
does not
respond
Touch SYSTEM to set system to Heat. Make sure the temperature is set higher than the Inside
temperature.
Touch 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.

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