OEM Carrier 40VA Control Transformer HT01BC116 for Model PG8MAA048070AAJA

This OEM control transformer is the factory-specified replacement for the Carrier PG8MAA048070AAJA gas furnace, cross-referencing original part number HT01BC116 (superseded by HT680054). The transformer steps down 120V line voltage to 24V to power the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When it fails, the furnace goes completely silent: no ignition attempt, no blower response, and no thermostat communication. A failed transformer is one of the most commonly misdiagnosed furnace faults — always confirm 24V output at the secondary terminals before condemning the control board.

• Specs: 40VA rating | 120V primary | 24V secondary | Wire-lead terminations | Replaces OEM part numbers HT01BC116, HT01BC115, HT680054 and related superseded Carrier transformer SKUs
• OEM vs Generic: OEM-matched transformers deliver the correct VA rating and secondary voltage tolerance, protecting downstream components like the gas valve and control board from under- or over-voltage conditions that generic units can cause.
• 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 at primary leads before disconnecting. Photograph wiring orientation prior to removal. Confirm 24V at secondary after installation before closing the panel.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Engineered as a direct OEM replacement for Carrier model PG8MAA048070AAJA packaged gas furnaces. Also compatible with select Bryant and Payne units sharing the same transformer specification. Always verify primary voltage (120V) and VA rating (40VA) against your unit's data plate before ordering. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy — no guesswork.