Step One: Use the manual control handle on the automatic gas valve to turn off the gas to the main burner and pilot. Allow at least 5 minutes for built up gas to disperse before proceeding. Use extreme caution and take more time if your fuel is bottled gas; it doesn’t dissipate as quickly.

 
Step Two: Once the gas has dissipated, set the thermostat well below room temperature. Turn the manual control handle to PILOT and light the pilot, holding the handle there for a minute. Then release the handle and turn it to ON.

Adjusting the Pilot Flame: The Pilot flame should be blue and should cover the thermocouple. Before adjusting the flame turn the thermostat down and turn off the power to the system. Then reset the thermostat when done.

 
Cleaning the Pilot Orifice: One cause of trouble lighting the pilot light, is the orifice may be plugged. To clean the orifice, you will need to shut off the gas supply.

 Step One: Turn the gas inlet handle to a right angle with the pipe.

Step Two: Disconnect the thermocouple tube and the pilot gas line form the automatic gas valve.

Step Three: Remove the bracket holding the pilot and the thermocouple.

Step Four: Use a stiff wire brush to clean out the orifice and reattach the bracket, pilot gas line, and the thermocouple tube.

Step Five: Turn on the gas and relight the pilot light.

1. Remove the cover and detach the wires of the old thermostat from their lettered terminals. Tag and label each wire to ensure you re-hook each wire up to the correct terminal. The tags will also work as a barrier to keep the wires from  siding back into the hole of the wall.

2. Attach the new bade plate to the wall with screws. Checking to ensure that the new thermostat is  level. Strip the wire ends if necessary, Wrap the ends clockwise around the terminal screws then tighten the screws with the wire attached.

3. Mount the new thermostat cover on the base plate by following the manufacture’s instructions.

Cleaning a Thermostat.

Cleaning your thermostat ensures trouble-free operation over its life . To clean your thermostat in three easy steps, simply remove the cover, many electronic thermostats are wireless and snap on and off with ease. Clean the contact points by turning the thermostat all the way up until the points are closed. Remove the cover and wiggle a strip of thin cord between the two points. Blow any lessen debris off the points. Once this is done clean the heat sensor. Brush the coil gently and then blow the heat sensor clan of debris. Then lastly clean the switch contacts. Simply do this with a cotton swab that as been moistened with a small amount of alcohol. By keeping your thermostat clean you prevent long-term damage allow for only quick fixes for heating an cooling systems.

For maximum efficiency, you should clean the heater system and inspect the burner and thermostat throughout the colder months. If a problem with the heater dose presents itself, here are some possible causes and solutions.

*Should be performed by a professional.