The 390686-15 Resideo Pilot Orifice is a genuine OEM liquid propane (LP) gas pilot orifice engineered to provide precise pilot gas flow in compatible pilot burner assemblies. Featuring a 0.009-inch orifice opening, this component helps maintain proper pilot flame characteristics for reliable ignition, thermocouple heating, and safe operation of LP-fired heating equipment. Manufactured to OEM specifications, the 390686-15 is designed for dependable performance in residential and commercial gas heating applications.

Cross-Reference

• 390686-15
• Honeywell 390686-15
• Resideo 390686-15

Direct OEM

Yes
Genuine Resideo OEM replacement part.

Compatible Brands

• Resideo
• Honeywell
• Honeywell Home
• LP Gas Heating Equipment Utilizing Compatible Pilot Assemblies

Application

Used in LP gas pilot burner systems requiring a 0.009-inch pilot orifice for proper pilot flame regulation.

Common applications include:

• Gas Furnaces
• Boilers
• Water Heaters
• Unit Heaters
• Commercial Heating Equipment
• Standing Pilot Ignition Systems

Always verify appliance model compatibility before ordering.

Related Components

• Pilot Burner Assemblies
• Thermocouples
• Thermopiles
• Pilot Gas Tubing
• Gas Valves
• Ignition Components
• Flame Sensors
• Burner Assemblies

Technician Notes

• Designed specifically for LP (Propane) gas applications.
• Verify correct orifice sizing before installation.
• A partially restricted orifice may cause weak pilot flame conditions.
• Inspect pilot tubing and burner ports for contamination during service.
• Replace damaged or enlarged orifices to maintain proper combustion characteristics.

Common Symptoms of Failure

• Pilot will not ignite
• Weak pilot flame
• Intermittent pilot outage
• Delayed burner ignition
• Thermocouple not heating properly
• Burner lockouts
• Unstable pilot flame
• Restricted pilot gas flow

Installation Tips

1. Shut off gas and electrical power before servicing.
2. Confirm LP gas application requirements.
3. Carefully remove the existing pilot orifice.
4. Inspect pilot tubing for debris or contamination.
5. Install the new orifice without overtightening.
6. Restore gas supply and leak-check all connections.
7. Verify proper pilot flame appearance and operation.
8. Follow manufacturer service procedures and local codes.

Recommended Inspection Items

• Thermocouple condition
• Thermopile output
• Pilot burner cleanliness
• Gas valve operation
• Pilot tubing condition
• Gas pressure settings
• Main burner ignition
• Venting system condition
• Flame quality and stability