OEM Carrier 40VA Control Transformer HT01BC116 for Model PG8MAA042090ACJA

This OEM control transformer is the factory-specified replacement for the Carrier PG8MAA042090ACJA gas furnace. The transformer steps down line voltage (120V) to the 24V AC signal required to power the thermostat, control board, and all low-voltage system controls. When it fails, the entire control circuit goes dark — the thermostat becomes unresponsive, the furnace won't initiate any heating cycle, and there is no call-for-heat signal reaching the gas valve or inducer. Replacing this part with a genuine OEM unit restores factory-spec voltage regulation and protects downstream components.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory-matched output tolerance | Designed for Carrier PG8MAA042090ACJA gas furnace control circuit
• OEM vs Generic: OEM transformers (HT01BC116) are wound to exact VA and voltage tolerances. Undersized or off-tolerance generic units can under-power the control board, cause nuisance lockouts, or fail prematurely under peak-demand conditions.
• 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 verify 24V output post-install). Label and photograph all low-voltage wiring before disconnecting from the board terminals.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PG8MAA042090ACJA gas furnaces using the HT01BC116 transformer. Always verify VA rating and primary/secondary voltages on your existing unit's data plate before ordering. Need fitment confirmation? Our parts specialists verify compatibility before your order ships.