OEM Carrier 40VA Control Transformer HT01BC116 for Model PG8JAA036110ADJA

This OEM control transformer (part# HT01BC116) is the factory-specified replacement for the Carrier PG8JAA036110ADJA packaged gas furnace. The transformer steps down 120V line voltage to 24V AC, powering the low-voltage control circuit that connects your thermostat, gas valve, inducer relay, and control board. When it fails, the entire control circuit goes dead — the thermostat shows no response, the system won't call for heat, and there is no activity from any 24V component. A failed transformer is often misdiagnosed as a thermostat or control board issue, making correct identification critical before replacing more expensive parts.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory-matched output impedance | Compact form factor for direct OEM fitment
• OEM vs Generic: This OEM unit meets Carrier's exact VA rating and insulation class. Generic transformers may be under-rated for VA load, causing premature burnout under full 24V circuit demand — especially when multiple zones or accessories are wired in.
• Install difficulty: 2/5 — Shut off power at the disconnect and confirm zero voltage with a multimeter before touching wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts. Label or photograph all low-voltage wiring before disconnecting. Check for shorted 24V wiring before installing the new transformer to avoid repeat failure.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Confirmed fit for Carrier model PG8JAA036110ADJA packaged gas furnace. Verify 120V/24V configuration and VA rating on your unit's data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before every order — contact us before you buy.