OEM Carrier Hot Surface Igniter Replacement Kit 120V Silicon Nitride for Model PG8MAA048070AAJA

This is the factory OEM hot surface igniter replacement kit (part number 331930-751) for the Carrier PG8MAA048070AAJA gas furnace. The hot surface igniter is the component responsible for lighting the gas burner on every heating call. When it fails, your furnace will attempt ignition, fail to light, and go into safety lockout — leaving you with no heat. Common symptoms include the furnace cycling on but never firing, or a hard lockout fault code on the control board after one or more failed ignition attempts.

• Specs: 120V Hot Surface Igniter (HSI) | Silicon Nitride (Si3N4) element | Replaces OEM part LH33ZS004 and predecessors LH33ZS001, LH33ZS002, LH33ZS003 | Complete upgrade kit for 33/33-1/3" tall Carrier mid-efficiency furnace platforms
• Kit Includes: Silicon nitride igniter element | OEM-matched wire harness connector | Mounting bracket — everything needed for a direct drop-in upgrade with no splicing or fabrication required
• OEM vs Generic: This is a genuine Carrier factory-authorized igniter kit. OEM silicon nitride igniters maintain precise resistance tolerances required by your furnace control board. Generic igniters can vary in resistance and geometry, leading to unreliable ignition timing or repeat failures within one season. Important: Handle the igniter element by the ceramic base only — skin oils contact with the silicon nitride surface will cause premature failure.
• Install Difficulty: 2/5 — Turn off gas supply and 120V power at the disconnect before starting. Tools needed: 1/4" nut driver, needle-nose pliers. Photograph existing wiring before disconnecting the harness. Total job time: 20–30 minutes for most technicians.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PG8MAA048070AAJA gas furnace. This kit is also cross-referenced for many Carrier, Bryant, and Payne 33-1/3" mid-efficiency furnace platforms sharing the LH33ZS-series igniter. Always verify your existing igniter part number against your unit's data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists confirm fitment before your order ships.