Q3400A1024 Igniter Flame Rod Assembly for Honeywell Systems (24V)
Q3400A1024/U igniter flame rod assembly with wiring harness, connector, and mounting bracket.
Q3400A1024/U igniter flame rod assembly technical specification diagram with dimensions and electrical ratings.
Q3400A1024/U igniter flame rod assembly with ceramic insulators and metal mounting bracket.
Q3400A1024/U igniter flame rod assembly showing silicon nitride element and insulated connector features.
Q3400A1024/U igniter flame rod assembly with wiring harness and plug connector for 24V furnace systems.
Technician installing Q3400A1024/U igniter flame rod assembly with step-by-step installation instructions.
Q3400A1024/U igniter flame rod assembly with compatibility chart for Honeywell Smart Valve systems.
Q3400A1024/U igniter flame rod assembly shown with various HVAC application examples including furnaces and boilers.
Q3400A1024/U igniter flame rod assembly with wiring harness and protective storage case.
Q3400A1024/U igniter flame rod assembly with wiring harness, connector, and mounting bracket.
Q3400A1024/U igniter flame rod assembly technical specification diagram with dimensions and electrical ratings.
Q3400A1024/U igniter flame rod assembly with ceramic insulators and metal mounting bracket.
Q3400A1024/U igniter flame rod assembly showing silicon nitride element and insulated connector features.
Q3400A1024/U igniter flame rod assembly with wiring harness and plug connector for 24V furnace systems.
Technician installing Q3400A1024/U igniter flame rod assembly with step-by-step installation instructions.
Q3400A1024/U igniter flame rod assembly with compatibility chart for Honeywell Smart Valve systems.
Q3400A1024/U igniter flame rod assembly shown with various HVAC application examples including furnaces and boilers.
Q3400A1024/U igniter flame rod assembly with wiring harness and protective storage case.

Q3400A1024 Igniter Flame Rod Assembly for Honeywell Systems (24V)

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$44.08
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$44.08
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Q3400A1024 Igniter Flame Rod Assembly for Honeywell Systems (24V)

Key Features

  • Direct-replacement pilot assembly designed for reliable surface ignition and continuous flame sensing in 24V gas burner systems.
  • Integrated silicon carbide hot-surface igniter and durable alloy flame rod ensure prompt ignition and dependable flame detection.
  • High-grade ceramic insulation body protects electrical components against extreme heat and voltage leakage.
  • Precision-engineered mounting tab ensures accurate positioning relative to the pilot burner gas jet.

Replaces / Cross-Reference Part Numbers

  • Q3400A1024
  • Q3400A1024/U
  • Q3400A1040
  • Q3400A1032
  • Q3400A1016
  • Q3400A1008
  • R42640-001
  • X1085
  • 1009524
  • AFN643

Compatibility & Fitment

Compatible with select Honeywell SmartValve systems, pilot burners, and gas-fired heating equipment, including:

  • Pilot Burner Systems: Q3450, Q3620, Q3480
  • Gas Valve Systems: SV9500, SV9500M, SV9600, IG9500
  • Honeywell SmartValve Series: SV9501, SV9502, SV9601

When to Replace

  • The heating system cycles through ignition but fails to detect a flame, triggering a safety lockout.
  • The igniter element is cracked, fractured, or does not glow when 24V power is applied.
  • The flame sensing rod is excessively corroded, pitted, or damaged, causing an unstable flame signal.
  • The wiring harness or plug connector is degraded, loose, or burnt from thermal exposure.

Installation Tips

  • Disconnect all electrical power and shut off the main gas line to the heating equipment prior to servicing.
  • Unplug the quick-connect wiring harness from the control module and remove the retention screw securing the old igniter rod assembly.
  • Align the new Q3400A1024 assembly onto the pilot burner mounting bracket, taking care not to touch or strike the fragile igniter tip.
  • Tighten the mounting hardware securely and snap the wiring harness connector back into position.
  • Restore power and gas supply, then initiate a call for heat to confirm smooth ignition and continuous flame verification.

Compatible Models

Locate the model number of your appliance or equipment on the manufacturer's label and use it to check compatibility before ordering

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FAQs

This part is designed for use with Honeywell Home and Resideo SmartValve pilot systems, specifically the SV9500 and SV9600 series smart valves. It is compatible with SV9500M valves and functions with Q3450 and Q3480 pilot hardware within the SmartValve system. Please match the full part number on your existing igniter/flame rod assembly to ensure compatibility before ordering.
This assembly replaces and cross-references with part numbers Q3400A1024/U, Q3400A1024, and R42640-00. It is also compatible with the Q3450, Q3480, and Q3620 hardware families used in SmartValve systems. If your furnace documentation specifies these numbers, verify your valve and pilot assembly configuration to confirm this is the correct replacement.
Typical symptoms include a failure to ignite the pilot, intermittent ignition, the burner attempting to light and then shutting down, or the furnace failing to prove the flame. Since this assembly performs both ignition and flame-sensing, failure often manifests as either a lack of spark/glow at startup or a flame that lights briefly but is not detected by the control system.
For an experienced DIYer or HVAC technician, this replacement is of moderate difficulty and typically takes between 20 and 45 minutes. You will generally need a screwdriver, a nut driver, and possibly needle-nose pliers. Always shut off the power to the furnace and the gas supply before beginning service. Exercise caution to avoid cracking the igniter element or misaligning the flame rod relative to the pilot flame.
Before replacing the assembly, inspect the pilot assembly for dirt, oxidation, or misalignment, and check the wire connections leading to the SmartValve. Verify that the furnace is receiving 24V control power and that the pilot flame path is clear. Issues such as poor grounding, a weak pilot flame, or contamination on the flame-sensing rod can mimic the symptoms of a failed igniter/flame rod assembly.
Common causes of failure include age-related thermal stress, repeated heat cycles, contamination buildup on the flame rod, and physical damage to the igniter element during maintenance. Additionally, restricted combustion airflow, pilot flame irregularities, and corrosion at electrical connections can shorten the service life or cause flame-sensing errors even when the component is not completely broken.