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Appendix
26
homexpert
tm
by Honeywell THR842DUK Wireless Digital Thermostat
27
In case of difficulty
Thermostat screen
is blank
• MakesuretwofreshAAalkalinebatteriesareproperlyinstalled(see
page 16).
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14-15)andsystemconguration(pages21-25).
• Ifredlightonrelayboxison,thethermostatandrelayboxmayhavelost
communication with each other. Check for metal objects or other devices
that may block or interfere with the wireless signal. Try the test procedures
described on pages 16-20.
• 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.
In case of difficulty
Desired temperature
cannot be maintained
• Ifremediesdescribedonpage26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).
If this symbol flashes on the screen during normal operation, a fault has
occurred.
• Pressthebuttonontherelayboxtoilluminatethegreenlightand
temporarily restore system function. This is a manual override which will
not correct the fault; it will only allow the system to provide heat until
the fault is corrected.
• Iftheproblemcannotbecorrected,contactHoneywellCustomerCare
for assistance (see back cover for contact information).
14


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