Honeywell PRO PRO TH4000 - Troubleshooting Common Issues; Blank Display; System Unresponsive

PRO TH4110D / TH4210D
17
69-1760EFS—01
ENGLISH
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atheating&coolingsystemison.
• Makesurefurnacedoorisclosedsecurely.
• MakesurefreshAAalkalinebatteriesarecorrectlyinstalled(see
page 16).
Heating or
cooling system
does not respond
• SetsystemswitchtoHeat (see page 7). Make sure the temperature is
set higher than the Inside temperature.
• SetsystemswitchtoCool (see page 7). Make sure the temperature is
set lower than the Inside temperature.
• Wait5minutesforthesystemtorespond.
In case of difficulty