Honeywell THR842D Wireless Room Thermostat User Guide

June 6, 2024
Honeywell

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THR842D
Wireless Room Thermostat with ECO energy-saving feature
User Guide

VIEW ALL honeywell THERMOSTAT MANUAL

Room temperatureHoneywell THR842D Wireless Room
Thermostat-

Set temperature, inquiry

Honeywell THR842D Wireless Room Thermostat- inquirySet temperature, adjustment

Honeywell THR842D Wireless Room Thermostat-

Switch ON/OFF (frost protection enabled)Honeywell THR842D Wireless Room
Thermostat- Switch

Operating indicator

Heating demand indicatorHoneywell THR842D Wireless Room Thermostat-
indicator

Frost protection

Fault indicatorHoneywell THR842D Wireless Room Thermostat- Fault
indicator

Low battery indicatorHoneywell THR842D Wireless Room Thermostat- Low
battery
RF communication

Loss of RF communications. The Relay Box operates in Failsafe mode, as set by Installer.

Honeywell THR842D Wireless Room Thermostat- InstallerHeat/cool change over

Honeywell THR842D Wireless Room Thermostat-changeover

Energy-Saving ECO feature

Pressing the green ECO button gives a timed period at a different, predefined temperature (18°C)Honeywell THR842D Wireless Room Thermostat-
temperatureTo set the ECO energy savings time periodHoneywell THR842D Wireless Room Thermostat-
period

Display shows a countdown of ECO time remainingHoneywell THR842D Wireless
Room Thermostat- remaining

Pressing or will now allow the ECO temperature to be changed

To exit ECO mode, press ECO button again

Honeywell THR842D Wireless Room Thermostat- ECO button

Operation of the Relay Box

Automatic OperationHoneywell THR842D Wireless Room Thermostat-
Operation

Press the button to temporarily override the current relay position

Temporary Manual Override

Press the button to temporarily override the current relay position

Honeywell THR842D Wireless Room Thermostat-
adjustment

If RF communication is lost, red LED lights and Relay Box operates in failsafe mode, as set in Installer ModeHoneywell THR842D Wireless Room Thermostat-
failsafeFor assistance with this product please visit livewell.honeywellhome.com

resideo logobk-electronic GmbH
Hardhofweg 40
74821 Mosbach
Germany
Country of origin: UK
©2019 Resideo Technologies Inc. This product is manufactured by Resideo and its affiliates. The Honeywell Home trademark is used under license from Honeywell International Inc. All rights reserved.

HONEYWELL THR842D Wireless Room Thermostat User Guide

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