OEM Carrier Control Transformer 40VA 120V–24V for Model PG8DAA024050ABJA

This OEM control transformer (part number HT01BC116) is the factory-specified replacement for the Carrier PG8DAA024050ABJA packaged 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 it fails, nothing in the system responds: no call-for-heat, no fan, no ignition sequence. A blown transformer is often the first component to inspect when a furnace goes completely silent.

• Specs: 40VA capacity | 120V primary / 24V secondary | Compatible with standard R and C thermostat wiring | Matches OEM mounting footprint for drop-in replacement
• OEM vs Generic: This OEM unit is wound to Carrier's exact VA rating and insulation class, ensuring stable 24V output under full control-circuit load. Generic transformers rated at nominal 40VA frequently sag under peak draw, causing nuisance lockouts and intermittent control faults.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output post-install), wire nuts or spade connectors. Photograph existing wiring before disconnecting. Inspect low-voltage wiring for shorts before energizing — a shorted control wire will blow the new transformer immediately.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PG8DAA024050ABJA packaged gas furnace. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — contact us before placing your order.