OEM Carrier Furnace Control Transformer 120V–24V 40VA for Model PG9MAA048100ADKA

This is the factory-specified OEM control transformer for the Carrier PG9MAA048100ADKA gas furnace. The transformer is the heart of your furnace's 24V control circuit — it steps line voltage down from 120V to the 24V AC signal that powers your thermostat, control board, gas valve, and all safety circuits. When the transformer fails, the entire control system goes dark: the thermostat goes blank, the furnace won't respond to any call for heat, and no status codes will display. In many cases, a shorted transformer is caused by a downstream wiring fault, so always inspect low-voltage wiring before installing the replacement.

• Specs: Primary Voltage: 120 VAC | Secondary Voltage: 24 VAC | VA Rating: 40VA | Frequency: 50/60 Hz | Single Phase | Dimensions: 3" L × 2-3/16" W × 2" H
• OEM vs Generic: This OEM transformer is wound to exact Carrier factory tolerances. Generic units frequently under-deliver VA capacity under load, causing nuisance lockouts, intermittent thermostat dropouts, and premature control board failures — especially in multi-stage systems with zone valves.
• Install Difficulty: 2/5 — Shut off furnace power at the disconnect and breaker before starting. Label or photograph all 24V wiring connections before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, non-contact voltage tester. Check for short circuits in the low-voltage wiring before energizing. Typical job time: 20–30 minutes.
• Warranty: 1-year OEM manufacturer warranty. Orders placed by 5 PM EST ship the same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PG9MAA048100ADKA gas furnace. OEM part number HT01BC116 has been superseded by HT680054 — both are fulfilled as the current production OEM unit. Also replaces HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, and HT01AA012 across the Carrier/Bryant/Payne furnace family. Verify your unit's data plate voltage before ordering. Have fitment questions? Our HVAC parts specialists confirm compatibility before you buy — order with confidence.