OEM Carrier Furnace Transformer 40VA 120V-24V for Model PG8JEB066090AAJA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG8JEB066090AAJA gas furnace. The transformer converts 120V line voltage down to 24V to power the low-voltage control circuit — including your thermostat, gas valve, inducer relay, and control board logic. When it fails, nothing in the low-voltage circuit responds: the thermostat goes blank, the furnace won't call for heat, and the system appears completely dead even with 120V line power present.

• Specs: 40VA rating | 120V primary / 24V secondary | 60Hz | Step-down design | OEM part number 322666-701 | Also cross-references HT01BC115C, 4600-01V04K28
• OEM vs Generic: This is a genuine Factory Authorized Part built to Carrier's exact VA and voltage tolerance specifications. Generic transformers often under-deliver VA capacity under load, causing nuisance lockouts and accelerated control board wear.
• Install difficulty: 2/5 — Shut off all power to the furnace at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all 24V secondary wires before disconnecting. Verify 24VAC output at secondary terminals after installation before closing the panel.
• Warranty: 1-year OEM factory warranty. In stock and ships the same business day from our warehouse.

Compatibility: Designed for Carrier model PG8JEB066090AAJA gas furnace. Verify primary voltage (120V) and VA rating (40VA) on your existing transformer's label before ordering. Cross-reference part numbers: HT01BC115C, 4600-01V04K28, J1841. Note that the current active Carrier successor part is HT680054. Have a fitment question? Our HVAC parts specialists confirm compatibility before you order — call or chat today.