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User Manual
About your new thermostat
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
This Manual: http://www.manuallib.com/file/2598268
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Quick reference
Cooling system is
ECO mode countdown
running (see page 9)
(see page 11)
ECO mode is on
(see page 11)
eco
25.
Appears when
target temperature
is showing
Current temperature
(or target temperature
when flashing)
System fault
Low battery warning
(see page 25)
(see page 18 to replace
batteries)
homexpert
by Honeywell THR840DUK Digital Thermostat
tm
Heating system is
Press to change
running (see page 9)
temperature
(see page 10)
Press to turn ECO mode
on or off (see page 11)
°
c
Press to turn thermostat
0
on or off (see page 8)
Standby symbol
appears when
thermostat is off (see
page 8)
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