Installation and Setup
Activate batteries and mount thermostat
Remove the thermostat cover (see page 13). Discard the plastic tab inside to activate the batteries, then replace batteries. The thermostat should display the current room temperature.
Replace the thermostat front cover, then mount the thermostat on the wall bracket as shown at left.
NOTE: This symbol will flash on the screen when battery power is low. Remove cover and replace batteries with two fresh AA alkaline batteries.
System test
Set temperature to maximum
35.0° C
Heat should turn on
35.0° C
homexperttm by Honeywell THR840DUK Digital Thermostat
After installation, you should check to make sure the system is working properly.
1Check the power supply to make sure the heating system is on.
2Press the p button to raise target temperature to maximum (35°C).
If the system is set up properly, the “heating” symbol should appear on the thermostat display, and the heating system should begin running.
3To stop the test, press the q button to lower the target temperature to an appropriate level. The heating system should turn off and the “heating” symbol on the thermostat screen should disappear.
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