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Appendix
32
homexpert
tm
by Honeywell THR872CUK Wireless Programmable Thermostat
33
In case of difficulty
Thermostat screen
is blank
• MakesuretwofreshAAalkalinebatteriesareproperlyinstalled(see
page 24).
Heating or cooling
system does not
respond
• Checkthermostatbatteries(seeabove).
• Makesureheatingandcoolingsystemshavepower.Checkfusesand
circuit breakers and replace or reset as needed.
• Checkwiring(pages22-23)andsystemconguration(pages30-31).
• Ifredlightonrelayboxison,thethermostatandrelayboxmaynotbeable
to communicate. See “Rebinding Procedure” on page 33.
• Ifaboveremediescannotresolvetheproblem,thethermostatmay
have to be moved. Try a location closer to the relay box, or farther
away from interference by metal objects or electronic devices such as
televisions, sound systems, PCs, etc.
Desired temperature
cannot be maintained
• Ifaboveremediescannotresolvetheproblem,thethermostatmay
have to be moved. Make sure it is not installed near sources of hot or
cold air (radiators, windows, heating or cooling ducts).
In case of difficulty (re-binding procedure)
If you must replace a wireless thermostat or relay box, the system
may not work properly afterward. Follow the steps below to
re-establish wireless communication.
1 Hold thermostat about 1 or 2 metres from the relay box, then
press and hold the relay box button for 15 seconds.
Note: After 5 seconds the red light flashing pattern will change,
but you must hold down the button for at least 15 seconds.
2 Release the relay box button, then press and hold it again for 5
seconds, until the red light flashes evenly (“binding” mode).
3 Release the relay box button, then press the thermostat OFF
button.
4 Press and hold the thermostat p, q and < buttons until
CONTROL BINDING appears on the display screen.
5 Press the thermostat OK button to signal the relay box. The red
light on the relay box should turn off. If not, wait a few seconds,
then press OK again.
6 Relocate and test the thermostat, as shown on page 24.
Press and hold these thermostat buttons (step 4)
Press thermostat OK button (step 5). Relay box
red light should turn off.
Press and hold relay box button
(steps 1-2)
CONTROL BINDING
17


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