OEM Carrier 40VA Control Transformer 120V–24V for Model PG8JAA036045ACJA

This OEM control transformer is the factory-specified replacement for the Carrier PG8JAA036045ACJA gas furnace, sold under OEM part number HT01BC116 (superseded by HT680054). The transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and ignition board. When it fails, the furnace goes completely unresponsive: no call for heat is processed, no ignition sequence begins, and the thermostat display may go blank. A failed transformer is often caused by a shorted low-voltage wire or faulty component downstream, so always inspect the 24V circuit before replacing.

• Specs: 40VA rating | 120V AC primary (multi-tap 110–125V) | 24V AC secondary | Foot-mount configuration | Wire-lead connections with pre-installed insulated female connectors
• OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances, ensuring proper inrush current handling and long-term reliability. Generic units often underperform at rated VA, causing nuisance lockouts or premature burnout of downstream 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 verify 24V output post-install). Always check for a shorted low-voltage wire causing the original failure before energizing the new transformer.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG8JAA036045ACJA gas furnace. Note: OEM part number HT01BC116 has been superseded by HT680054 — both are 40VA 120V/24V and are direct drop-in replacements. Cross-references include HT01BC115, HT01BC120, HT01BB126, and HT01CT120. Verify your unit's data plate voltage before ordering. In stock — order by 3PM and it ships today.