OEM Carrier Hot Surface Igniter LH33ZS004 for Model PG9MAA048100AFKA

This is the factory OEM hot surface igniter for the Carrier PG9MAA048100AFKA gas furnace, sold under OEM part numbers LH33ZS004 and 329491-401 (Gasket Ignitor kit). The igniter is a critical component in the furnace ignition sequence: on every call for heat, the control board energizes the igniter, which glows incandescent to ignite the gas burner. When it fails — due to cracking, oxidation, or an open circuit — the furnace will attempt ignition, fail to establish a flame, and go into lockout mode, leaving you with no heat. Symptoms include a furnace that clicks on, runs the inducer, but never produces heat, often triggering a fault code on the control board.

• OEM Part Numbers: LH33ZS004 (Hot Surface Ignitor) | 329491-401 (Gasket Ignitor kit) — factory-matched to Carrier PG9MAA048100AFKA specifications
• OEM vs Generic: OEM igniters are manufactured to exact resistance and geometry tolerances. Aftermarket igniters frequently run outside resistance spec, causing nuisance lockouts, premature cracking, or failure within the first heating season. This is the same part shipped from Carrier's factory.
• Install Difficulty: 2/5 — Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers. Always shut off gas and power before servicing. Do not touch the igniter element with bare hands — skin oils cause hot spots and premature failure. Handle only by the mounting bracket or leads.
• Warranty & Shipping: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG9MAA048100AFKA gas furnace. Also cross-references with Bryant and Payne models sharing the LH33ZS004 igniter specification — verify your unit's data plate and part number before ordering. Have a question about fitment? Our HVAC parts team confirms compatibility before you buy.