OEM Carrier Furnace Control Transformer 120V–24V 40VA for Model PG8DAA048115ABJA

This OEM control transformer is the factory-specified replacement for the Carrier PG8DAA048115ABJA gas furnace. The transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When this part fails, nothing in the control circuit responds: the thermostat goes dead, the furnace won't call for heat, and you may measure zero voltage at the 24V secondary terminals. It is a silent but total system failure.

• Specs: Input (Primary) 120V AC | Output (Secondary) 24V AC | 40VA power rating | 60Hz | Foot-mount configuration | Wire lead connections | Integrated secondary fuse protection
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control boards. Undersized or off-tolerance generic units can cause erratic lockouts, nuisance blown fuses, and premature control board failure — particularly on multi-stage furnaces like the PG8DAA048115ABJA.
• Install difficulty: 2/5 — Shut off power at the breaker and confirm zero voltage before disconnecting. Tools needed: flathead and Phillips screwdriver, needle-nose pliers, multimeter. Photograph all wire connections before removal. The new transformer mounts in the same footprint as the original.
• Warranty & Shipping: 1-year OEM factory warranty. In stock — ships same business day from our warehouse.

Compatibility & Cross-Reference: Fits Carrier PG8DAA048115ABJA gas furnaces. OEM part number HT01BC116 has been updated to superseding part number HT680054 — both are the same 40VA 120V–24V transformer. This listing also crosses to: HT01BC116B, HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, and HT01AA012. Always verify input voltage, output voltage, and VA rating on your unit's data plate before ordering. Our team is happy to confirm fitment — just reach out before you buy.