OEM Carrier 40VA Control Transformer 120V/24V — HT01BC116 for Model PG8JAA024070ABJA

This OEM Carrier control transformer (part number HT01BC116) is the factory-specified step-down transformer for the Carrier PG8JAA024070ABJA gas furnace. It converts 120V line voltage down to 24V to power the furnace's low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When the transformer fails, the entire control circuit goes dead: you'll get no response from the thermostat, no inducer startup, and no heat. A failed transformer often trips its internal thermal fuse or shows 0V on the secondary terminals when tested with a multimeter.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | Wire lead connection type | Class 2 rated for HVAC control circuits
• OEM vs Generic: This OEM transformer is wound and fused to Carrier's exact 40VA specification, ensuring proper inrush current handling and thermal protection. Generic alternatives often run undersized VA ratings, risking premature burnout or nuisance tripping under compressor/valve load.
• Install difficulty: 2/5 — Shut off power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Label or photograph all wire connections before removing the old unit. Match secondary wire leads carefully — reversed polarity will damage the control board.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Engineered for the Carrier PG8JAA024070ABJA gas furnace. Note: OEM part HT01BC116 has been superseded by Carrier part HT680054 — both are fully compatible replacements for this model. Verify your existing transformer reads 120V primary and 24V secondary before ordering. Have a fitment question? Our HVAC parts team will confirm compatibility before you buy.