OEM Carrier 40VA 24V Transformer for Gas Furnace PY3GPAA48115NA

This transformer supplies the entire 24V control circuit of your Carrier PY3GPAA48115NA furnace. It converts the 120V (or 208/240V) line feed down to the low voltage that powers the thermostat, integrated control board, gas valve, and inducer relay. A failed transformer leaves the furnace completely dead — a blank thermostat, no clicking relays, no inducer spin-up on a call for heat. If it has shorted internally you may notice a sharp electrical-burning smell, a loud 60Hz hum, a casing too hot to touch, or a low-voltage control fuse that pops repeatedly the instant power is restored. Rated 40VA with a 24V secondary and multi-tap primary (120/208/240V), this OEM transformer is matched to the precise control load Carrier specified for this model. Its laminated steel core and high-temperature Class B insulation are designed for the heat soak inside a sealed furnace cabinet, delivering stable secondary voltage even under simultaneous relay pull-in. Why OEM matters: generic transformers frequently carry lower VA ratings or sloppy voltage regulation. Under the combined inrush of the gas valve and inducer, an underrated unit's secondary voltage sags below the threshold relays need to latch, producing random no-heat lockouts that defeat technicians for hours. The OEM part holds 24V firmly and keeps your control board's relays from chattering. Install difficulty: 2/5. Tools: 1/4" and 5/16" nut driver, multimeter, wire-marking tape. #1 SAFETY WARNING: Shut off the furnace breaker before disconnecting any leads — the primary taps carry lethal line voltage. Confirm the primary tap matches your supply voltage before energizing. Ships same business day from our stocked warehouse on orders placed before 3 PM CST. Covered by a 1-year OEM warranty and 30-day hassle-free returns on uninstalled parts.

Compatibility

This part is compatible with Carrier model PY3GPAA48115NA. Always verify the part number against your unit's data plate before ordering.

Why Choose OEM?

OEM parts are manufactured to the exact factory specifications for your unit. Generic aftermarket alternatives may fit physically but often use lower-rated components that reduce equipment life and void manufacturer warranties. When the cost difference between OEM and generic is $10-30, the OEM part is always the smarter investment on a system worth $5,000-$15,000.

Shipping & Returns

Same-day shipping on orders before 3 PM CST. Standard delivery 2-5 business days, express options available at checkout. 30-day hassle-free returns on uninstalled parts — free return shipping included. 1-year OEM factory warranty coverage.