A Quick Test; Troubleshooting - ICM Controls SC 1800 Installation, Operation & Application Manual

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
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
The system is not turning on
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
Thermostat turns on and off too
frequently
Temperature display is not
accurate

A Quick Test

button until the set temperature is 3°F above the room

Troubleshooting

Check batteries; display is blank when batteries are not present or are dead.
Check that the fan switch setting matches your system (gas or electric).
Adjust temperature differential (see "Setting the Temperature Differential," Page 8).
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.
Remedy