OEM Carrier Control Transformer 120V-24V 40VA for Model PG8JAA036070ACJA

This OEM control transformer is the factory-specified replacement for the Carrier PG8JAA036070ACJA gas furnace. The transformer steps down 120V line voltage to 24V AC, powering every low-voltage component in your system — including the thermostat, gas valve, inducer relay, and control board. When this part fails, you'll typically experience a completely unresponsive thermostat, a furnace that won't initiate any call for heat, or a blown low-voltage fuse with no obvious short. It is a silent but critical link between your line voltage and your entire control circuit.

• Specs: 40VA rating | 120V primary / 24V secondary | 60 Hz single phase | Foot-mount with wire leads | OEM part HT01BC116, superseded to HT680054
• OEM vs Generic: This factory-matched OEM unit is wound to exact VA and voltage tolerances. Undersized or off-tolerance generic transformers can overheat under combined thermostat + AC contactor + gas valve loads, causing nuisance trips or premature 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. Label or photograph all wiring before disconnecting the old transformer. Verify 24V output at the C and R terminals on the control board after installation.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered as a direct OEM drop-in replacement for the Carrier PG8JAA036070ACJA gas furnace. Also replaces legacy part numbers HT01BC115, HT01BB126, HT01CT120, HT01BC120, and HT01AW115. Always verify your unit's data plate voltage before ordering. Not sure it fits? Our parts team confirms fitment before you buy — just ask.