User Manual
About your new thermostat
homexperttm by Honeywell THR840DUK Digital Thermostat
Quick reference
The THR840DUK is an
QUICK START GUIDE
Your new thermostat is
1 | Install and set up thermostat |
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| (if this has not been done by a professional installer) | See pages |
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 |
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(see page 11) |
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| ECO |
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is showing | 25.0 | ° C |
Appears when |
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target temperature |
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Current temperature |
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(or target temperature |
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when flashing) |
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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)
6 | 7 |