OEM Carrier Furnace Transformer 120V–24V 40VA for Model PG8MAA024045ABJA

This OEM step-down transformer is the factory-specified control-circuit transformer for the Carrier PG8MAA024045ABJA gas furnace. It converts 120V line voltage to 24V AC, powering every low-voltage component in your system — thermostat, gas valve, inducer relay, and control board. When the transformer fails, the furnace goes completely silent: no ignition attempt, no blower response, no thermostat communication. OEM part number HT01BC116 has been superseded by Carrier's updated replacement HT680054, which ships in a factory-authorized Carrier parts box and drops in without modification.

• Specs: Primary voltage 120V AC | Secondary voltage 24V AC | 40VA rating | 50/60 Hz single-phase | Foot-mount configuration | Wire lead connections with insulated female quick-connects
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances. Under-rated generic units can overheat, blow fuses repeatedly, or damage the IFC control board — costing far more than the transformer itself.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching terminals). Photograph all wire connections before removal. Check the low-voltage fuse (typically 3A) on the control board — a failed transformer often blows it, and it must be replaced at the same time.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered by 5 PM local time.

Compatibility: Confirmed fit for Carrier model PG8MAA024045ABJA gas furnace. Supersedes legacy part numbers HT01BC116, HT01BC115, HT01BB126, HT01BC120, HT01AW115, and several additional cross-references. Verify your unit's control circuit is 120V primary / 24V secondary before ordering. Our fitment team is available to confirm compatibility — reach out before you order.