OEM Carrier Furnace Control Transformer 40VA 120V/24V for Model PG8JAA060090AAJA

This OEM step-down control transformer is the factory-specified replacement for the Carrier PG8JAA060090AAJA gas furnace, superseding original part number HT01BC116 (current OEM replacement: HT680054). The transformer converts 120V line voltage down to 24V to power the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and ignition board. When it fails, absolutely nothing in the control system responds: no call for heat, no inducer start, no display — the furnace goes completely dark electrically. A blown internal fuse or shorted secondary winding are the two most common failure modes.

• Specs: 40VA rating | 120V primary | 24V secondary | 50/60 Hz single-phase | Compact 3" L × 2-3/16" W × 2" H form factor | Wire lead connections
• OEM vs Generic: This OEM unit is wound to exact Carrier factory tolerances, ensuring stable 24V output under full control-circuit load. Generic transformers with undersized VA ratings can sag under load, causing erratic lockouts, nuisance faults, and premature board failures.
• Install difficulty: 2/5 — Shut off furnace power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output after install). Photograph all wire connections before removing the old transformer. Label leads if needed. Total job time: 20–30 minutes.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.

Compatibility: Direct OEM replacement for Carrier model PG8JAA060090AAJA gas furnace. Supersedes discontinued part HT01BC116; also cross-references HT01BC115, HT01BB126, HT01CT120, HT01AW115, and HT01AA012. Always verify 40VA/120V/24V ratings on your unit's data plate before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — order today and get it shipped fast.