OEM Carrier Furnace Control Transformer 120V–24V 40VA for Model PG8MAA048070ADJA

This OEM step-down control transformer is the factory-specified replacement for the Carrier PG8MAA048070ADJA gas furnace. It converts the 120V line voltage to the 24V AC signal that powers your thermostat, gas valve, inducer relay, and every other low-voltage control in the system. When this transformer fails — or the secondary fuse it feeds blows — absolutely nothing in the control circuit works: no call for heat, no inducer startup, no ignition attempt. Replacing it is the fastest way to restore full furnace operation after a wiring short or overload event.

• Specs: Primary 120 VAC | Secondary 24 VAC | 40 VA rating | 50/60 Hz | Single-phase | Wire-lead connections | Compact chassis mount (3″ L × 2-3/16″ W × 2″ H)
• OEM vs Generic: This is a genuine OEM-spec replacement for Carrier part HT01BC116 (superseded by HT680054). OEM units are wound to exact VA tolerances, protecting downstream components. Generic imports often run under-rated VA, causing nuisance tripping or premature burnout of the secondary winding.
• Install Difficulty: 2/5 — Shut off 120V power at the disconnect AND the breaker before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching). Photo all wiring connections before removal. Discharge any residual voltage with your meter. Typical swap time: 20–30 minutes.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day when ordered by 5 PM local time.

Compatibility: Direct OEM replacement for Carrier model PG8MAA048070ADJA gas furnace. Also replaces legacy part numbers HT01BC116, HT01BC115, HT01BB126, HT01CT120, HT01BC120, and several others in the Carrier/Bryant/Payne family — confirm your data plate voltage specs (120V primary, 24V secondary, 40VA) before ordering. Have a question about fitment? Our HVAC parts specialists verify compatibility before you buy — call or chat now. Order today and your part ships today.