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The Honeywell International q3400a1024 is an ignitor and flame rod assembly designed for use with the SM9500 Smart Valve system. This assembly combines the ignition electrode and flame-sensing rod into a single replaceable unit, allowing the Smart Valve to reliably light and prove burner flame during each heating cycle. It is a direct service part intended for installation by licensed HVAC technicians performing maintenance or repair on gas heating equipment equipped with the SM9500 Smart Valve.
This assembly is used in residential and light commercial gas heating applications where the SM9500 Smart Valve controls ignition sequencing and flame proving. The SM9500 Smart Valve integrates gas control, ignition, and flame sensing into a self-contained system, and the q3400a1024 provides the field-replaceable electrode and sensing rod component for that platform. Technicians typically encounter this part when diagnosing ignition failures or intermittent no-heat calls on equipment using the SM9500.
Designed as an OEM-style replacement ignitor and flame rod assembly for gas heating systems equipped with the Honeywell SM9500 Smart Valve.
Installation should be performed by a licensed HVAC technician. Shut off gas supply and disconnect power to the appliance before removing the existing assembly. Verify the replacement assembly is properly seated and secured before restoring power and gas. Confirm flame-proving operation through a full ignition cycle before returning the unit to service.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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