OEM Carrier 40VA Control Transformer HT01BC116 for Model PG9MAA036040ADKA

This is the factory OEM replacement control transformer (part number HT01BC116) for the Carrier PG9MAA036040ADKA gas furnace. The transformer steps down line voltage (120V primary) to the 24V secondary signal used by your thermostat, control board, gas valve, and every other low-voltage component in the system. When the transformer fails, the entire control circuit goes dark — the furnace will not respond to the thermostat, will not attempt ignition, and will show no status LED activity whatsoever. A failed transformer is often mistaken for a bad control board, so always verify 24V output at the secondary terminals before replacing costlier components.

• Specs: 40VA rating | 120V primary / 24V secondary | Replaces OEM part HT01BC116 | Factory-matched for Carrier PG9MAA036040ADKA
• OEM vs Generic: This OEM transformer is wound and rated to exact factory specifications, ensuring the 24V signal remains stable under full control-circuit load. Generic alternatives often carry lower VA headroom, which can cause erratic board behavior, nuisance lockouts, and premature failure of downstream 24V components.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 0V before touching wires and 24V output after install). Photograph or label all wiring connections before disconnecting the old unit.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier PG9MAA036040ADKA 80% AFUE gas furnace. Verify your unit's data plate shows part number HT01BC116 or cross-reference your model before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — contact us anytime.