OEM Carrier 40VA Control Transformer for Model PY3GPAA60090NA

This OEM Carrier transformer (part number HT01BD209) is the factory-specified replacement for the Carrier PY3GPAA60090NA packaged unit. The transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and all safety switches. When this component fails, the system goes completely silent: no thermostat response, no contactor pull-in, and no call-for-heat or call-for-cool. A blown transformer is commonly caused by a shorted control wire, a failed contactor coil, or a mis-wired thermostat that overloads the secondary circuit.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA Rating: 40VA | Mount type: bracket/chassis mount | OEM part number: HT01BD209
• OEM vs Generic: This OEM unit meets Carrier's exact VA rating and insulation class, ensuring the secondary circuit is never under-powered. Generic transformers often run underrated VA, causing nuisance trips and premature failure under peak load conditions.
• Install difficulty: 2/5 — Disconnect power at the disconnect box before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output after install). Label all low-voltage wires before disconnecting. Inspect all control wiring for shorts before energizing — a shorted wire is the #1 cause of transformer failure.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3GPAA60090NA packaged gas/electric unit. Always verify your unit's data plate voltage requirements match before installation. Our parts specialists are available to confirm fitment before you order — no guesswork required.