Troubleshooting - Honeywell Home T4 Pro TH4110U2005 Product Information

Troubleshooting

If you have difficulty with your thermostat, please try the following suggestions. Most problems can be corrected quickly and easily.
Display is blank
"Wait" appears on the
screen
Temperature settings do not
change
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© 2023 Resideo Technologies, Inc. All rights reserved.
The Honeywell Home trademark is used under license
from Honeywell International, Inc. This product is
manufactured by Resideo Technologies, Inc. and its
affiliates.
Tous droits réservés. La marque de commerce
Honeywell Home est utilisée avec l'autorisation
d'Honeywell International, Inc.
Ce produit est fabriqué par Resideo Technologies, Inc.
et ses sociétés affiliées.
Todos los derechos reservados. La marca comercial
Honeywell Home se utiliza bajo licencia de Honeywell
International, Inc.
Este producto es fabricado por Resideo Technologies,
Inc. y sus afiliados.
• 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.
• Compressor protection feature is engaged. Wait 5 minutes for the system to restart safely, without
damage to the compressor.
• If display says "unlock", thermostat owner has set a lockout setting. If not, verify you are in the correct
mode (heat, cool, em heat or auto); see page 1.
• If you are in the correct mode, but you cannot set the heat from 40 °F to 90 °F (4.5 °C to 32 °C), or
set the cool from 50 °F to 99 °F (10 °C to 37 °C), you may have range-stops restricting your setting.
Check with the installer to see if they set range-stops.
Resideo Technologies Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
https://www.honeywellhome.com/support
33-00613EFS—05 S.A. Rev. 03-23 | Printed in United States
33-00613EFS-05