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TROUBLESHOOTING
Symptom
Screen is blank
• Check circuit breaker and reset if necessary.
• Make sure power switch at heating & cooling system is on.
• Make sure furnace door is closed securely.
Screen is
• To change the screen brightness or color, see backlight options in the Preferences menu (see page
difficult to read
21).
• At 2 am each day, thermostats change screen colors for an hour, to prevent burn-in. Touch the screen
at any time to restore pre-set screen colors.
Heating or
• Press SYSTEM to set system to Heat. Make sure the temperature is set higher than the Inside
cooling system
temperature.
does not
• Press SYSTEM to set system to Cool. Make sure the temperature is set lower than the Inside
respond
temperature.
• Check circuit breaker and reset if necessary.
• Make sure power switch at heating & cooling system is on.
• Make sure furnace door is closed securely.
• If "Waiting For Equipment" is displayed, the compressor protection timer is on. Wait 5 minutes for the
system to restart safely, without damaging the compressor.
REGULATORY INFORMATION
FCC Compliance Statement (Part 15.19)
(USA only)
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received,
including interference that may cause undesired
operation.
FCC Warning (Part 15.21) (USA only)
Changes or modifications not expressly approved by the
party responsible for compliance could void the user's
authority to operate the equipment.
FCC Interference Statement
(Part 15.105 (b)) (USA only)
This equipment has been tested and found to comply with
the limits for a Class B digital device, pursuant to Part 15
of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a
residential installation. This equipment generates uses
and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions,
may cause harmful interference to radio communications.
However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does
cause harmful interference to radio or television
reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to
correct the interference by one of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and
receiver.
• Connect the equipment into an outlet on a circuit
different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV
technician for help.
THX9321 PRESTIGE
Table 17. Troubleshooting.
Action
Equipment interface module,
thermostats and outdoor sensor
To comply with FCC and Industry Canada RF exposure
limits for general population/ uncontrolled exposure, the
antenna(s) used for these transmitters must be installed
to provide a separation distance of at least 20 cm from all
persons and must not be co-located or operating in
conjunction with any other antenna or transmitter.
Portable Comfort Control
This portable transmitter with its antenna complies with
FCC and Industry Canada RF exposure limits for general
population/uncontrolled exposure. This device must not
be co-located or operating in conjunction with any other
antenna or transmitter.
Section 7.1.2 of RSS-GEN
Under Industry Canada regulations, this radio transmitter
may only operate using an antenna of type and maximum
(or lesser) gain approved for the transmitter by Industry
Canada. To reduce potential radio interference to other
users, the antenna type and its gain should be so chosen
that the equivalent isotropically radiated power (e.i.r.p.) is
not more than that necessary for successful
communication.
Section 7.1.3 of RSS-GEN
Operation is subject to the following two conditions:
1. this device may not cause interference, and
2. this device must accept any interference, including
interference that may cause undesired operation of
the device
163
®
2.0 AND THX9421 PRESTIGE
®
IAQ WITH EIM
68-0311—07
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