OEM Carrier 40VA Control Transformer 120V-24V for Model PG8UAA048111ABJA

This OEM control transformer (part number HT01BC116, superseded by HT680054) is the factory-specified replacement for the Carrier PG8UAA048111ABJA gas furnace. The transformer steps down 120V line voltage to 24V to power the low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When this transformer fails, the entire control circuit goes dead: your thermostat goes unresponsive, the furnace will not initiate a heating cycle, and no status codes are generated because the board itself has no power.

• Specs: 120V primary input | 24V secondary output | 40VA rating | 60Hz | Foot-mount configuration | Wire lead connections with insulated female connectors
• OEM vs Generic: OEM transformers are wound to exact factory VA tolerances, protecting the control board from voltage spikes. Generic units can run over- or under-voltage on the secondary, causing nuisance lockouts or premature board failure.
• Install difficulty: 2/5 — Disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all wire leads before disconnecting. Mount securely to prevent vibration-induced fatigue on terminals.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Designed for the Carrier PG8UAA048111ABJA gas furnace. Note that OEM part HT01BC116 has been superseded by HT680054 — both are 120V-24V 40VA and are direct drop-in replacements for this unit. Verify your existing transformer's input voltage, output voltage, and VA rating on the data plate before ordering. Questions about fitment? Our HVAC parts specialists confirm compatibility before you buy.