ASI's Learn About Gas Furnace Spark Ignition Systems
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Furnace Failure #1 Cause
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Gas Furnace Safety Devices
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Two Stage Gas Heat
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Also see Air Conditioning above
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Also see Gas Heat above
Radiant Heating Systems
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T-Stat for Heat Pumps
T-Stat Multi-Stage
T-Stat Call for Heat
T-Stat Call for Cool
Residential Zone Controls
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Air Distribution Types
Air Filtration Types
Air Sterilization or UV Lamps
Gas Piping DIY Dangers
Heat Recovery
Humidity and your comfort
Indoor Air Quality
Efficiency Ratings SEER EER
Evaporative Coolers
HVAC Equipment Grounding
HVAC Contractor Scam Alerts
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Intermittent Spark or Standing Pilot Ignition
For the Intermittent Pilot Ignition type, after the control board has confirmed that the inducer fan is in fact running or in the case with no inducer fan upon a call for heating the heating system will open the pilot gas valve which is part of the main gas valve assembly and send high voltage to the spark ignitor.The Heating system control board confirms that the gas pilot has in fact lit and is burning with a flame sensor of some kind, this usually looks like a small metal cylinder that is in direct contact with the flame itself. The board then switches on the main gas valve that allows gas to flow to the burner assembly. The burner then lights and the flame should be uniform across all burner tubes and mostly blue in color where it can be seen.
The Heating system control board confirms that the main gas burner has in fact lit and is burning with a flame sensor of some kind, this usually looks like a small metal cylinder that is in direct contact with the flame itself and can sometimes be the same sensor that the pilot is sensed with. As long as the flame stays lit and the call for heating as explained in thermostat control article the system should maintain the gas valve open.
Other safety devices are now active, please see this article for more information on the many types of safety devices that can shut down your gas furnace heating system.
CAUTION - Always be very careful with electricity as it can be lethal, if you are not comfortable performing any of these steps please do not perform them, of course you are performing these steps at your own risk.
Important Note: The heating system control board is sometimes very sensitive to static electricity, avoid touching this board to prevent failure.
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