Honeywell RTHL3550D User Manual

Operating Manual
69-2583ES—01 14
In case of difficulty
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is blank
• MakesurefreshAAalkalinebatteriesarecorrectlyinstalled
(see page 12).
Temperature
settings do not
change
Make sure heating and cooling temperatures are set to acceptable ranges:
• Heat:40°to90°F(4.5°to32°C).
• Cool:50°to99°F(10°to37°C).
Heating or
cooling system
does not respond
• PressSYSTEM button to set system to Heat. Make sure the
temperature is set higher than the Inside temperature.
• PressSYSTEM button 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.
• Wait5minutesforthesystemtorespond.

Honeywell RTHL3550D Specifications

General

Brand	Honeywell
Model	RTHL3550D
Category	Thermostat
Language	English