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Changing Fahrenheit (F) to Celsius (C)
The thermostat is preset to display the temperature in degrees Fahrenheit.
You may change the display readout to Celsius if desired.
1. Move the manual switch marked F (Fahrenheit) and C (Celsius) locat-
ed at the center of the circuit board to the desired setting (page 5).
2. Press RESET button located to the right of the LCD display to
register the change.
The display will change to show the temperature in your desired
temperature scale. To return the thermostat to its original setting, repeat
steps 1 and 2 above.
Note: Pressing the RESET button resets the 1st and 2nd stage differential
to factory preset conditions.
LED Indicator
The LED indicator illuminates during a call for second stage heating or
cooling. The auxiliary stages are used to maintain comfort during
extremes in weather conditions. If the LED is illuminated too frequently
during periods of moderate temperature, check the differential settings
(page 6).
Troubleshooting
Symptom Remedy
8
Thermostat does not turn
on system.
Check wiring.
(See INSTALLATION)
Check fuse. Replace with 2 amp
fuse if fuse has opened.
Thermostat turns on and
off too frequently.
Increase temperature differential.
(See DIFFERENTIAL)
System fan does not
operate properly.
Move fan option switch to either
gas or electric, to match system.
(See INSTALLATION)
Thermostat does not display
proper room temperature.
Check F Fahrenheit/C Celsius
switch located at top center of cir-
cuit board for proper position. If a
new selection is made, press
RESET button located directly
below LCD display.