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Table 2--Thermostat
Troubleshooting
SYMPTOM
WHAT TO CHECK
Check for 24 vac between R and C at terminal connections.
Blank LCD
Both R and C must be connected for proper operation.
Temperature sensor (inside thermostat) reading out of
range. Check sensor for damage. The outdoor temperature
"-"
(2 dashes) On Temperature
Display
sensor (if installed) is open, not connected, or shorted (both
buttons pushed simultaneously). If recycling power does not
clear display, thermostat
should be replaced.
Brownout condition or voltage too low to thermostat. Double
"E2" On Temperature
Display
check winng and check for 24 vac between R and C. E2
will clear 15 sec after proper voltage is restored.
After the selected number of hours of blower operation =FIL-
TER" will display on LCD, This is to remind the homeowner
"RLTER"
On Temperature
Display
to "check" the filter. Press RESET FILTER button to clear
display and reset timer to 0.
Select COOL mode. Set desired temperature to 10 ° F be-
low room temperature. Simultaneously press FAN and UP
arrow buttons to defeat timers. Check for COOL ON icon
Cooling Will Not Come On
and 24 vac at Y (first-stage) terminal. If present, thermostat
is OK and problem is with equipment or widng. If not
present, replace thermostat.
Selact HEAT mode. Set desired temperature to 10° F
above room temperature. Simultaneously press FAN and
Heating Will Not Come On
UP arrow buttons to defeat timers. Check for HEAT ON and
24 vac at W. If present, thermostat is OK and problem is
with equipment or widng. If not present, replace thermostat.
Heat/Cool Set Points (Desired
Temperatures)
-- A minimum
difference of 2 _ is enforced between heating and cooling set points.
This is done by allowing one setting to "push" the other, to
maintain this difference.
Auto Changeover--
When the auto changeover mode is selected,
a change from heat to cool (or vice versa) will not occur until an
opposite mode demand has existed for 20 minutes. If the set point
is changed, the 20 minute requirement is ignored.
Power On Check--
When AC power is first applied, all segments
of the display are turned on for a few seconds, and the temperatme
display indicates
the 2<ligit
code: "AC" for single-speed
air
conditioner.
Outdoor Temperature --When
artoutdoor temperature sensor is
attached, outdoor temperature
can be read by pressing UP and
DOWN arrows at the same time.
WIRING DIAGRAM NOTES:
1. Furnace must control its own second stage heat operation via
furnace control algorithm. Refer to indoor equipment Installation
Instructions for proper setup.
2. Terminals marked with * may not be present on equipment.
3. Refer to outdoor equipment Installation Instructions for proper
setup.
4. Refer to fan coil Installation Instructions for proper wiring.
5. Program thermostat to bring on G (Fan) with any W (Heat)
selection. See Step 3-Set Thermostat Conf_atration section.
4
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