Honeywell 21d64-2 Universal Nitride Ignitor Kit

Product Description

The HONEYWELL 21d64-2 is a universal silicon nitride ignitor upgrade kit designed to replace worn or failed hot surface ignitors in gas heating systems. Silicon nitride ignitors offer greater durability and resistance to thermal shock compared to older silicon carbide designs, making this kit a reliable choice for service calls where the original ignitor has failed. Licensed HVAC technicians and furnace service professionals install this type of kit as part of routine heating system maintenance or emergency repair work.

This ignitor upgrade kit is suited for use in residential and light commercial gas furnace applications where a universal-fit hot surface ignitor is needed. The universal design allows it to serve as a drop-in or bracket-adapted replacement across a wide range of furnace configurations. It is particularly useful when the original OEM ignitor is discontinued or unavailable, allowing the technician to complete the repair with a single stocked part.

Key Features

• Silicon nitride ignitor element provides improved thermal shock resistance over silicon carbide
• Universal upgrade kit design broadens compatibility across multiple furnace platforms
• Intended for hot surface ignition systems in gas-fired heating equipment
• Suitable for service and repair by licensed HVAC professionals

Compatibility

Designed as a universal OEM-style replacement ignitor upgrade kit for use in residential and light commercial gas furnace hot surface ignition systems. No specific model compatibility data was provided in the product listing.

Installation Notes

Installation should be performed by a licensed HVAC technician. Before servicing, shut off all electrical power to the furnace at the disconnect switch and allow the existing ignitor to cool completely before handling, as silicon nitride ignitors are fragile and can crack from skin oils or mechanical stress. Follow all applicable local codes and manufacturer wiring diagrams during reconnection. Verify ignitor operation through a complete call-for-heat cycle before returning the system to service.

Technical Specifications

• Ignitor Type: Silicon Nitride (Hot Surface)
• Kit Type: Universal Upgrade Kit

Standard Information

• Brand: HONEYWELL
• Manufacturer Part Number: 21d64-2