OEM Carrier Furnace Control Transformer 120V–24V 40VA for Model PG8UAA036045ACJA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG8UAA036045ACJA gas furnace. The transformer converts 120V line voltage down to 24V AC to power all low-voltage control-circuit components — including the thermostat, gas valve, inducer relay, and control board. When it fails, the entire low-voltage circuit goes dead: the thermostat goes blank, the furnace won't respond to any call for heat, and no LED fault codes will display because the board itself loses power. This part ships under OEM part number HT01BC116, now fulfilled as the updated successor HT680054 — a factory-authorized direct replacement in a Carrier/Bryant factory parts box.

• Specs: Primary Voltage: 120V AC | Secondary Voltage: 24V AC | VA Rating: 40VA | Frequency: 50/60 Hz | Phase: Single | Connection: Wire leads with insulated female quick-connects | Dimensions: 3" L × 2-3/16" W × 2" H
• OEM vs Generic: This is a genuine OEM Carrier transformer built to factory tolerance. Generic transformers often lack the exact mounting footprint and rated VA capacity, leading to voltage sag under load — which causes erratic thermostat behavior, nuisance lockouts, and premature control board failure.
• Install Difficulty: 2/5 — Turn off power at the breaker and confirm voltage is zero before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wire connections before disconnecting. The transformer typically mounts with two screws on the furnace cabinet wall; wire leads connect via 1/4" insulated female quick-connects.
• Warranty: 1-year OEM manufacturer warranty. In-stock orders ship same business day from our warehouse when placed before the cutoff.

Compatibility: Designed for the Carrier PG8UAA036045ACJA gas furnace. OEM part number HT01BC116 is superseded by HT680054 — both are covered by this listing. Also cross-references: HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, and several other legacy Carrier/Bryant part numbers. Verify your unit's data plate voltage (120V primary) before ordering. Need a fitment check? Our team confirms compatibility before you buy.