OEM Carrier Hot Surface Igniter (LH33ZS004) for Model PG9MAA024040ACKA

The Carrier LH33ZS004 Hot Surface Igniter is the factory OEM replacement ignition component for the Carrier PG9MAA024040ACKA gas furnace. During every heating cycle, the control board energizes the igniter at 120V, heating the element to over 2,000°F to ignite the gas burners. When the igniter fails — through cracking, carbon buildup, or electrical burnout — the furnace attempts ignition, fails, and locks out, leaving you with no heat. Typical symptoms include the inducer starting normally, followed by a lockout error code after one to three failed ignition attempts.

• Specs: 120V AC | 5 Amp draw | Silicon carbide element | OEM part number LH33ZS004 | Direct factory replacement — no modifications required
• OEM vs Generic: OEM Carrier igniters are manufactured to precise resistance and thermal-cycling tolerances. Generic igniters frequently fail prematurely due to inconsistent silicon carbide density, causing nuisance lockouts and compounding the original no-heat complaint.
• Install Difficulty: 2/5 — Power down and lock out the furnace before starting. Tools needed: 1/4" nut driver, flat-head screwdriver, needle-nose pliers. Avoid touching the element with bare hands — skin oils cause hot spots that crack the element prematurely. Confirm ignition sequence completes and flame is established before closing the unit.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered for the Carrier PG9MAA024040ACKA gas furnace. Also cross-references with superseded Carrier part numbers LH33ZS003, LH33ZS002, and LH33ZS001. Always verify your existing igniter's voltage and amperage rating against your unit's data plate before installation. Have a question about fitment? Our HVAC parts specialists verify compatibility before you order — contact us today.