Description
Product Summary
The Supco SSN21 Furnace Igniter - Exact Replacement is a professional-grade replacement part from Supco (Sealed Unit Parts Co.), a trusted name in HVAC/R and appliance parts since 1945. The 75M21 Igniter is used on Lennox® furnaces.
Hot surface igniters and flame sensors are the heart of modern gas furnace ignition. A cracked or weak igniter causes no-heat calls and lockouts, while a dirty or failing flame sensor causes the burners to shut down seconds after lighting. Match the igniter material (silicon carbide or silicon nitride), voltage, and mounting style to the original.
Key Features
- Drop-in Replacement
- Easy fit
- See Cross Reference tab for additional numbers
- WARNING: Prop 65 info
Specifications
| Brand | Supco |
|---|---|
| Part Number | SSN21 |
| Part Type | Igniter / Flame Sensor |
| Igniter Material | Silicon Carbide |
| Steady State Current | 3.0 to 3.6 Amps Maximum @ 115 Volts |
| Resistance | 50 to 1100 Ohms |
| Time to temperature | Less than 17 seconds @ 115 Volts |
| Minimum Temperature | 1800°F / 980°C @ 98 Volts |
| Maximum Temperature | 3100°F / 1705°C @132 Volts |
Cross Reference
The Supco SSN21 is a direct replacement for the following OEM and competitor part numbers. Always verify ratings and fit against the original part before installing.
| Replaces Part # | Manufacturer | Description |
|---|---|---|
| 75M21 | Lennox® | |
| 483396 | Coorstek® |
Ideal Applications
- Gas furnaces
- Boilers and gas appliances with hot surface ignition
What's Included
- (1) Supco SSN21 Furnace Igniter - Exact Replacement
Safety: Always disconnect power and follow lockout/tagout procedures before servicing electrical components. Installation should be performed by a qualified technician.
