ASI's Learn About Gas Furnace Standing Pilot Light
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R22 and R410A
Refrigerant Cycle
Dual Fuel or Hybrid Systems
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Dual Fuel Controls
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Duct Work & Grille Sizing
Ductwork Leaks & Testing
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Duct Work Troubleshooting
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Gas Heat & Furnaces
Cracked Heat Exchangers
Furnace Failure #1 Cause
Furnace Maintenance Tips
Gas Furnace Burner Ignition
Gas Furnace Flame Sensor
Gas Furnace HSI Ignitor
Gas Furnace Inducer Fans
Gas Furnace Safety Devices
Gas Furnace Spark Ignition
Gas Furnace Standing Pilot
Gas Furnace Troubleshooting
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Heating Repair or Replace
Heating Op Cost Comparison
Heating Consumer Alerts
Two Stage Gas Heat
Heat Pumps
Heat Pump Troubleshooting
Geo Thermal Heat Pumps
Also see Air Conditioning above
Oil Furnaces
Oil Furnace Troubleshooting
Also see Gas Heat above
Radiant Heating Systems
Boiler Troubleshooting
Residential Thermostats
T-Stat for Heat Pumps
T-Stat Multi-Stage
T-Stat Call for Heat
T-Stat Call for Cool
Residential Zone Controls
HVAC Other General
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
HVAC Can Help Prevent Illnesses
Variable Speed Systems
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Standing Pilot Ignition
With the standing pilot system the pilot stays lit all the time and as long as the pilot is lit and confirmed by the thermocouple (flame sensor) the unit will open the main gas valve upon a call for heating. The Heating system gas valve confirms that the gas pilot has in fact remained 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 is called a Thermocouple. If there is no flame or the thermocouple fails the pilot and main flame are turned off.For the Standing 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 main gas valve for the main burner. The burner then lights and the flame should be uniform across all burner tubes and mostly blue in color where it can be seen.
Other safety devices are now active, for more information on the many types of safety devices that can shut down your gas furnace heating system in our article on Furnace Safety Devices.As long as the flame stays lit and the call for heating is maintained as explained in thermostat furnace call for heat article the system should maintain the gas valve open.
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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