Honeywell THR840DUK About your new thermostat, Quick reference, Install and set up thermostat

User Manual

About your new thermostat

homexperttm by Honeywell THR840DUK Digital Thermostat

Quick reference

The THR840DUK is an easy-to-use thermostat designed to maintain a comfortable environment when you are at home and reduce energy costs when you are away. One touch of the ECO button overrides the normal temperature to maintain a lower, energy-saving level for a specified period of time (see page 11).

QUICK START GUIDE

Your new thermostat is pre-programmed and ready to go. Just check the steps below and change settings if needed:

1	Install and set up thermostat
	(if this has not been done by a professional installer)	See pages 12-24
2	Select heating (default) or cooling mode	See page 9
3	Set desired indoor temperature	See page 10

Cooling system is	ECO mode countdown	Heating system is
running (see page 9)	(see page 11)	running (see page 9)
ECO mode is on
(see page 11)
	ECO
is showing	25.0	° C
Appears when
target temperature
Current temperature
(or target temperature
when flashing)
System fault	Low battery warning	Standby symbol
(see page 25)	(see page 18 to replace	appears when
	batteries)	thermostat is off (see
		page 8)

Press to change temperature (see page 10)

Press to turn ECO mode on or off (see page 11)

Press to turn thermostat on or off (see page 8)

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