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Honeywell RTH221 User Manual

Honeywell RTH221
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69-2388ES-03
RTH221
1-day Programmable Thermostat
Operating
Manual
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Honeywell RTH221 Specifications

General IconGeneral
Stages1 Heat/1 Cool
Voltage24V
Temperature Range40°F to 90°F (4°C to 32°C)
BacklightNo
DisplayDigital
Power SourceBattery
CompatibilitySingle-stage heating and cooling systems
Dimensions3.75" H x 4.5" W x 1" D (9.5 cm x 11.4 cm x 2.5 cm)

Summary

About your new thermostat

Thermostat Features

Lists key features like ambient temperature display, one-touch setpoint access, and schedule savings.

Quick reference to controls

Thermostat Control Buttons

Describes the function of the Set, Hold, Run, and Up/Down buttons on the thermostat.

Set the clock

System switch (Heat/Cool)

Fan switch (Auto/On)

Using the schedule

Programmable Schedule Periods

Defines the four daily schedule periods: Wake, Leave, Return, and Sleep for energy savings.

Modifying the schedule

Temporary override of schedule

Permanent override of schedule

Built-in compressor protection

Battery replacement

In case of difficulty

Screen Issues and Settings Lock

Troubleshooting for blank screen or when temperature settings cannot be changed.

Compressor Protection Delay Issues

Explains flashing Cool On/Heat On indicators due to compressor protection.

Temperature Display and Sensor Errors

Interprets HI, LO, E1, E2 messages indicating temperature issues or sensor faults.

Customer assistance

One-year limited warranty

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