Troubleshooting - Honeywell Home Lyric T5 Wi-Fi Mode D'emploi

Troubleshooting

If the thermostat screen is blank:
• Check the circuit breaker or fuse that's connected to your heating or cooling
system and turn it on if it's switched off.
• Make sure the power switch at the heating or cooling system is on.
• Make sure the furnace door is closed securely.
If the screen is difficult to read:
• Increase screen brightness (see page 21 for instructions).
If the heating or cooling system isn't responding:
• Touch Mode on the thermostat home screen and set the system to Heat. Make
sure the temperature set point (the smaller of the two numbers) is higher than the
indoor temperature (the large number in the center of the screen).
• Touch Mode on the thermostat home screen and set the system to Cool. Make sure
the temperature set point (the smaller of the two numbers) is lower than the indoor
temperature (the large number in the center of the screen).
• Check the circuit breaker or fuse that's connected to your heating or cooling
system and turn it on if it's switched off.
• Make sure the power switch at the heating or cooling system is on.
• Make sure the furnace door is closed securely.
• After making these changes, wait 5 minutes for the system to respond.
If the temperature setting doesn't change:
• Make sure the heating and cooling set points are within the operating range.
– Heat: 40 ºF to 90 ºF (4.5 ºC to 32.0 ºC)
– Cool: 50 ºF to 99 ºF (10.0 ºC to 37.0 ºC)
If Cool On or Heat On is flashing:
• The compressor protection feature is engaged. Wait a few minutes for the system
to safely restart to avoid damaging the compressor. See page 9 for more
information.
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