Do not short jumper across terminals on the gas valve or at the system control to test installation.
Action
Set the
Off/Heat
switch to
Heat
; press the button until the set temperature is 3°F above the room
temperature.
Result
The heating system and fan should turn on; there may be a time delay depending on your system.
Action
Press the button until the set temperature is below the room temperature.
Result
The heating system should turn off; there may be a fan delay.
Action
Set the
Fan Auto/On
switch to
On
.
Result
The blower fan should turn on.
Action
Set the
Fan Auto/On
switch to
Auto
.
Result
The blower fan should turn off.
If the above
test was successful
, you have a proper installation.
If the above
test was unsuccessful
, double check that the wires are securely connected and are connected to the
proper terminals. Consult the troubleshooting section below.
Symptom
Remedy
The system is not turning on
Check batteries; display is blank when batteries are not present or are dead.
LCD is blank, or displaying
LO BAT
Replace batteries, or make sure the existing ones are properly installed.
Thermostat is not properly
controlling the fan
Check that the fan switch setting matches your system (gas or electric).
Thermostat turns on and off too
frequently
Adjust temperature differential (see “Setting the Temperature Differential,” Page 8).
Temperature display is not
accurate
Your thermostat has two options for temperature readout: Fahrenheit (default) and
Celsius. Check that the “jumper” is properly set to your preference.
Verify hole for wires behind thermostat is sealed with non-flammable insulation or
putty.
A Quick Test
Troubleshooting
