Where is the closest fire hydrant to 10209 N Altman Street Tampa FL 33612?
They may be connected to a pumper truck, which has a limited water supply or a fire hydrant to the pumper truck. The truck can then pump water to several hoses.
The limit switch is designed to prevent the burner from igniting when not enough airflow is going through the heat exchanger which would cause it to overheat. As you already figured out this could be caused by dirty filter or too many closed registers. I have in the past called a local HVAC company and they helped me over the phone so I could do it myself. You might not be as fortunate but it's worth a shot.
Fire hydrants are connected to the local water system to provide water for fire fighting purposes. Under normal conditions these hydrants provide plenty of water, but the pressure is too low to give the fire fighters the ability to spray water over long distances and up to higher levels as they need. So the firefighters use a pumping truck that has powerful pumps driven by diesel engines to pressurize the water. The pressurized output from the pumps is deliverd to the fire fighters' hoses.
