OEM Carrier 40VA Control Transformer 120V–24V for Model PG8JAA036110AAJA (HT01BC116)

This OEM control transformer is the factory-specified replacement for the Carrier PG8JAA036110AAJA gas furnace. It steps down 120V line voltage to the 24V AC signal that powers every low-voltage component in your system — including the thermostat, gas valve, inducer relay, and control board. When it fails, the result is total low-voltage shutdown: a blank thermostat, no ignition attempt, and a furnace that won't respond to any call for heat. Note: OEM part number HT01BC116 has been superseded by HT680054, the current factory-authorized direct replacement shipped in a Carrier factory parts box.

• Specs: Primary Voltage: 120V AC | Secondary Voltage: 24V AC | VA Rating: 40VA | Frequency: 60Hz | Phase: Single | Mounting: Foot mount with wire leads
• OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances. Undersized or off-spec generic units can cause nuisance lockouts, erratic thermostat behavior, or premature control board failure due to voltage sag under load.
• Install Difficulty: 2/5 — Shut off power at the breaker and confirm voltage is zero with a multimeter before disconnecting any wires. Photograph all wiring connections before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label leads with tape before disconnecting.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG8JAA036110AAJA gas furnace. Supersedes HT01BC116, HT01BC115, HT01BC120, HT01BB126, HT01CT120, HT01AW115, HT01AA012, HT01AQ110, and several other legacy part numbers. Always verify your unit's data plate voltage before ordering. Need fitment confirmation? Our HVAC parts team checks compatibility before you buy — order with confidence and get it shipped today.