506180−01 09/08
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Controlling the Heat/Cool Modes of
Operation
Press the screen anywhere − the first press turns on the
backlight.
While in the HOME screen, press MODE field;
repeated presses scroll through all the modes.
AUTO (autochangeover) mode allows the
thermostat to switch between Heating and
Cooling, whichever mode is dictated by the indoor
temperature. EM HEAT (emergency heat)
bypasses the first stage of heating (any stage[s] of
heat pump heating) and goes directly to the heat
stage used for maximum heating to more quickly
warm a very cold house.
When the indoor temperature decreases or increases, the
HEATING or COOLING cycle will turn on based on the dis-
played mode. When the HVAC system is on, the informa-
tion display (shown in figure 3) will display one or several
operational messages (listed in the table below). If the out-
door sensor is connected, and is turned on in both installer
and user settings, outdoor temperature will be included in
the displays. The table below summarizes the information
messages.
When the faults, errors, and service information displays
appear, action boxes will appear under the second line en-
tries, REMIND, CLEAR, SERVICE, or RESET. Press the
box to perform the action.
Figure 3. Home Screen
Information Displays:
Faults, Errors, and Service Information Operating Information
TEMP SENSOR ERROR, MEMORY ERROR
CALL FOR SERVICE
Top line: fault/error
Bot. line: action
SET DATE/TIME
Default DATE/TIME (MON JAN 1 12:00 PM)
[First time start up mes-
sage]
NO OUTDOOR SENSOR
REMIND CLEAR SERVICE
Top line: fault/error
Bot. line: action
HEATING, COOLING, HUMIDIFYING, DE-
HUMIDIFYING, SYSTEM OFF, OUTDOOR
TEMP xxF, INDOOR RH xx%,
MON SEP 24 3:OO PM
Top line: operation mes-
sages
Bottom line: date & time
REPLACE: MEDIA FILTER; UV LAMP; HUM PAD; METAL INSERT
REMIND RESET
Top line: serv. req’d
Bot. line: action
SCHEDULE ON, SCHEDULE OFF, WAIT, FAN
ON, FAN CIRC
MON SEP 24 3:OO PM
Top line: add’l operation
msgs
Bottom line: date & time
ROUTINE SYS CHECK−UP
REMIND RESET
Top line: serv. req’d
Bot. line: action
HOLD SETTING UNTIL PRESS SCHED TO
MON SEP 24 3:OO PM RESUME PROGRAM
[Alternating messages
during a held schedule]
NO OUTDOOR SENSOR, HUM SENSOR ERROR, HVAC ERROR
DETECTED
REMIND SERVICE
Top line: fault/error
Bot. line: action
LOW BATTERY
REMIND
Top line:fault/error
Bot. line: action
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