OEM Carrier Control Transformer 40VA 120V-24V for Model PG9MAB048080ABSA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG9MAB048080ABSA gas furnace. It converts 120V line voltage down to 24V AC to power the furnace's entire low-voltage control circuit — including the thermostat, control board, gas valve, and all safety switches. When this transformer fails, the furnace goes completely silent: no thermostat response, no ignition attempt, and no error codes on the control board because the board itself has lost power. If you're reading 0V between the R and C terminals on your control board, this transformer is the first component to test and replace.

• Specs: 40VA rating | 120V primary (input) | 24V secondary (output) | 60 Hz single-phase | Wire lead connections with insulated female quick-connect terminals | OEM Part# HT01BC116 (superseded by HT680054)
• OEM vs Generic: This is a genuine OEM Carrier transformer built to exact factory VA and voltage tolerances. Undersized or off-spec generic transformers can overheat, trip internal thermal cutouts, and damage sensitive low-voltage components including the control board and gas valve solenoids.
• Install difficulty: 2/5 — Shut off 120V power to the furnace at the breaker and verify power is off with a multimeter before touching any wiring. Photograph all wire connections before removal. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, multimeter. Reconnect leads to matching terminals and restore power to verify 24V output at R-C.
• Warranty: 1-year OEM manufacturer warranty. In stock — ships same business day from our warehouse when ordered by 5 PM local time.

Compatibility: Designed for the Carrier PG9MAB048080ABSA gas furnace. This OEM part number HT01BC116 has been officially superseded by HT680054 — both are accepted direct replacements for this model. Verify your existing transformer's primary voltage (120V) and VA rating (40VA) against your unit's data plate before ordering. Need fitment confirmation? Our HVAC parts specialists are ready to verify compatibility before you buy.