OEM Carrier Furnace Transformer 40VA 120V/24V — Part 322666-701 for Model PG8JEB066110AAJA

This OEM step-down control transformer is the factory-specified replacement for the Carrier PG8JEB066110AAJA gas furnace. It converts 120V line voltage to the 24V signal that powers your thermostat circuit, control board, gas valve, and every other low-voltage component in the system. When this transformer fails, the entire control circuit goes dark — your furnace will not respond to the thermostat, the board will not sequence, and you will have a complete no-heat condition. It is one of the first components a technician checks on a dead-board call.

• Specs: 40VA capacity | 120V primary | 24V secondary | 60Hz | OEM part number 322666-701 | Superseded by Carrier HT680054 (same specs, direct fit)
• OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances. Undersized or off-tolerance aftermarket units can cause nuisance low-voltage faults, board brownouts, or premature contactor coil failure.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching wiring). Label all wire connections before removal. Total job time: 20–30 minutes.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG8JEB066110AAJA gas furnace. If your unit's data plate lists OEM part 322666-701, this is your direct replacement. Not sure? Our parts team verifies fitment before you order — reach out and we'll confirm. Order now and get same-day shipping on in-stock parts.