OEM Carrier Furnace Control Transformer 40VA 120V–24V for Model PG9MAA060120ADKA

This OEM control transformer is the factory-specified replacement for the Carrier PG9MAA060120ADKA gas furnace. The transformer is a step-down device that converts the 120V line voltage into the 24V AC signal that powers all low-voltage control components — including the thermostat circuit, gas valve, inducer relay, and control board. When the transformer fails, the furnace goes completely unresponsive: the thermostat shows a call for heat but nothing happens, no inducer starts, and no error codes flash because the control board itself has lost power.

• Specs: 40VA rating | 120V primary (input) | 24V secondary (output) | 60 Hz | Single phase | Foot-mount configuration | Wire lead connections with insulated female quick-connect terminals
• OEM vs Generic: This is a genuine OEM Carrier replacement (part HT01BC116, updated successor HT680054). OEM transformers are wound to exact VA and voltage tolerances, ensuring the control board and gas valve receive a stable, clean 24V signal. Generic units often run outside tolerance, causing erratic board behavior or premature transformer burnout.
• Install difficulty: 2/5 — Turn off power at the disconnect and breaker before starting. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 0V before touching terminals and 24V output after install). Photograph all wire connections before disconnecting. Note: if the transformer failed due to a short in the low-voltage wiring, the new unit will fail immediately unless the fault is cleared first.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse when ordered before the daily cutoff.

Compatibility: Direct OEM replacement for Carrier PG9MAA060120ADKA gas furnaces. Also replaces legacy part numbers HT01BC116, HT01BC115, HT01BB126, HT01CT120, HT01BC120, and several additional Carrier/Bryant/Payne cross-references. Always verify your unit's data plate voltage and VA requirements before ordering. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy — order with confidence and get it shipped today.