OEM Carrier Furnace Transformer 120V–24V 40VA for Model PG8MAA048090ACJA

This OEM step-down transformer is the factory-specified control circuit component for the Carrier PG8MAA048090ACJA gas furnace. It converts 120V line voltage down to 24V AC to power the low-voltage control board, thermostat circuit, and all associated safety controls. When the transformer fails, the entire control circuit goes dark — you'll have a completely unresponsive furnace with no thermostat communication, no inducer startup, and no ignition attempt whatsoever. A failed transformer is also commonly caused by a shorted low-voltage wire or failed component elsewhere in the circuit, so always inspect for downstream shorts before installing the replacement.

• Specs: Primary Input: 120V AC | Secondary Output: 24V AC | VA Rating: 40VA | Frequency: 60 Hz | Mounting Type: Foot mount | Connection: Wire leads with insulated connectors
• OEM vs Generic: This is an OEM Carrier-authorized transformer built to exact factory VA and voltage output tolerances. Generic transformers frequently exhibit voltage sag under load and improper mounting footprints — one customer noted a generic unit would not mount correctly without modification. OEM ensures a true drop-in fit.
• Install Difficulty: 2/5 — Shut off power at the breaker and verify voltage is absent before disconnecting any wires. Photograph all wire connections before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output post-install). Note: always check for low-voltage shorts before powering up the new transformer to prevent immediate failure.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG8MAA048090ACJA gas furnace. OEM part number HT01BC116 has been superseded by updated part number HT680054 — both are covered by this listing and ship as the current OEM revision. Cross-references include HT01BC115, HT01BC116B, HT01BB126, and HT01CT120. Verify your unit's primary voltage (120V) on the data plate before ordering. Questions about fitment? Our team confirms compatibility before you buy.