OEM Carrier 40VA Furnace Control Transformer 120V/24V for Model PG8JEB060090AAJA

This OEM step-down control transformer is the factory-specified replacement for the Carrier PG8JEB060090AAJA gas furnace. The transformer converts 120V line voltage down to the 24V AC signal that powers the control board, thermostat circuit, gas valve, and all low-voltage safety controls. When this transformer fails, the entire low-voltage control circuit goes dead — your thermostat loses communication, the furnace won't respond to any call for heat, and nothing works. It is one of the most fundamental components in the entire system.

• Specs: 40VA rating | 120V primary | 24V secondary | 60Hz | Single-phase | Replaces OEM part# 322666-701 (superseded by HT680054)
• OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances, protecting sensitive control boards from voltage fluctuations. Aftermarket units may run outside ±5% tolerance, risking premature board failure or nuisance tripping of the 3A fuse.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all low-voltage wires before disconnecting. Verify 24V output with a multimeter before buttoning up the panel.
• Warranty: 1-year OEM factory warranty. In stock — ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PG8JEB060090AAJA gas furnace. Also cross-references to HT680054, HT01BC115C, HT01BC116, and HT01BB126. Always confirm primary voltage (120V) and VA rating (40VA) against your unit's data plate before ordering. Have a question about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today.