OEM Carrier Furnace Control Transformer 40VA 120V-24V for Model PG8DAA024050ACJA

This OEM step-down transformer is the factory-authorized replacement for the Carrier PG8DAA024050ACJA gas furnace (OEM part number HT01BC116, superseded by HT680054). The control transformer converts 120V line power down to 24V AC to energize the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When this transformer fails, nothing in the furnace responds: the thermostat goes dark, the inducer never starts, and you have a complete no-heat lockout with no error codes. If you measure 0V AC between the R and C terminals on the control board, a failed transformer is almost always the culprit.

• Specs: 40VA rating | 120V primary | 24V secondary | 50/60 Hz | Single phase | Foot-mount chassis | Wire lead connections with insulated female quick-connect terminals
• OEM vs Generic: This is a genuine OEM Carrier replacement — not an aftermarket approximation. OEM transformers are wound to exact VA tolerance, ensuring your control board and gas valve receive stable 24V under full load. Undersized or off-tolerance generic transformers can cause nuisance lockouts, intermittent thermostat behavior, and premature control board failure.
• Install difficulty: 2/5 — Shut off the furnace disconnect and confirm 0V at the transformer primary before touching any wiring. Tools needed: multimeter, Phillips screwdriver, 1/4" nut driver, needle-nose pliers. Always photograph existing wire connections before removal. Discharge any residual voltage and verify 24V output after installation before closing the panel.
• 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 PG8DAA024050ACJA gas furnace. This part (HT01BC116 / HT680054) also cross-references a wide range of legacy Carrier, Bryant, and Payne furnace models. Always verify the 40VA, 120V primary, and 24V secondary specifications against your unit's data plate and existing transformer label before ordering. Need fitment confirmed? Our HVAC parts specialists verify compatibility before you buy — contact us anytime.