OEM Carrier Furnace Control Transformer 120V–24V 40VA for Model PG9MAA024040ABKA

This OEM step-down control transformer is the factory-specified replacement for the Carrier PG9MAA024040ABKA gas furnace. The transformer converts 120V line voltage to the 24V low-voltage signal that powers your thermostat, gas valve, inducer, and control board. When this transformer fails, your furnace will exhibit a completely dead control circuit — no thermostat response, no inducer startup, and no ignition sequence whatsoever. A failed or shorted transformer is often confirmed by a tripped or blown 3A control fuse on the control board.

• Specs: Primary: 120 VAC | Secondary: 24 VAC | Rating: 40VA | Frequency: 50/60 Hz | Phase: Single | Replaces OEM Part# HT01BC116 (superseded by HT680054)
• OEM vs Generic: This OEM-grade transformer is wound to exact factory VA and voltage tolerances. Undersized or off-tolerance generic transformers can overheat under full control-circuit load, causing nuisance lockouts or premature failure of downstream components.
• Install difficulty: 2/5 — Always disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or quick-connect terminals. Photograph existing wiring before disconnecting leads. Verify fuse integrity on the control board before replacing the transformer.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day when ordered by 5 PM local time.

Compatibility: Engineered for the Carrier PG9MAA024040ABKA gas furnace and compatible Bryant/Payne models sharing the HT01BC116 transformer specification. Always verify primary voltage (120V), secondary voltage (24V), and VA rating (40VA) against your unit's wiring diagram before ordering. Our fitment team is available to confirm compatibility — contact us before you buy.