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2. Pilot light - Wikipedia

   en.wikipedia.org/wiki/Pilot_light

   In natural gas furnaces, water heaters, and room heating systems, a safety cut-off switch is normally included so that the gas supply to the pilot and heating system is shut off by an electrically operated valve if the pilot light goes out. This cut-off switch usually detects the pilot light in one of several ways: A flame rectification device. [2]

3. Your car's low tire pressure light may come on this week ...

   www.aol.com/cars-low-tire-pressure-light...

   If you think it's related to the cold weather, drive for a little bit and see if the light goes off as the tires heat up. If the light stays on, you'll want to add air to your tires using an air ...

4. Forced-air gas - Wikipedia

   en.wikipedia.org/wiki/Forced-air_gas

   Each room has an outlet from the duct system, often mounted in the floor or low on the wall – some rooms will also have an opening into the cold air return duct. Depending on the age of the system, forced-air gas furnaces use either a pilot light or a solid-state ignition system (spark or hot surface ignition) to light the natural gas burner. [3]

5. Pressure switch - Wikipedia

   en.wikipedia.org/wiki/Pressure_switch

   Murphy oil pressure gauges with switches that activate on low pressure. A pressure switch is a form of switch that operates an electrical contact when a certain set fluid pressure has been reached on its input. The switch may be designed to make contact either on pressure rise or on pressure fall.

6. Air handler - Wikipedia

   en.wikipedia.org/wiki/Air_handler

   The hot water or steam is provided by a central boiler, and the chilled water is provided by a central chiller. Downstream temperature sensors are typically used to monitor and control "off coil" temperatures, in conjunction with an appropriate motorized control valve prior to the coil.

7. Dieseling - Wikipedia

   en.wikipedia.org/wiki/Dieseling

   A structurally failing diesel engine will often accelerate when the throttle is released, even after fuel injection is switched off. Some carbureted engines have low-pressure fuel pumps: they are typically designed only to overcome a loss of suction in the fuel line near the engine due to fuel evaporation in hot weather, to supply sufficient ...