OEM Carrier 24V 40VA Control Transformer for PG8UAA036045ABJA

The control transformer in your Carrier PG8UAA036045ABJA furnace steps the incoming 120VAC line voltage down to the 24VAC that powers the thermostat, control board, gas valve, and inducer relays. It is the low-voltage power supply for the entire control circuit. When it fails or burns open, nothing on the 24V side responds: the thermostat screen goes blank, the furnace is completely dead on a heat call, and you may smell faint burnt varnish near the control box. A shorted gas valve or pinched thermostat wire often takes the transformer with it, so a repeat failure usually points to a downstream short. This OEM transformer is a 40VA, 120VAC primary / 24VAC secondary unit with class-2 secondary protection, sized to match the PG8UAA control load with margin for accessory relays. The 40VA rating is deliberate — it supplies the gas valve, board, and inducer relay simultaneously without sagging during pull-in. Why OEM: aftermarket transformers are frequently undersized (often 20–24VA) or wound with thinner-gauge primaries that run hot and overheat under the furnace's actual relay load. A weak secondary that droops below ~21VAC causes the gas valve to chatter and the board to brown out into intermittent faults that are nearly impossible to diagnose. The correct VA rating and secondary regulation protect the whole control circuit. Install difficulty: 2 of 5. Tools: 1/4" nut driver, Phillips screwdriver, multimeter, and wire labels. #1 safety warning: shut off power at the breaker AND the furnace disconnect before wiring — the primary side is live 120VAC. Confirm 24VAC across the secondary before re-energizing the board. Ships same business day from our stocked warehouse on orders placed before 3 PM CST. Backed by a 1-year OEM warranty and 30-day hassle-free returns on uninstalled parts.

Compatibility

This part is compatible with Carrier model PG8UAA036045ABJA. 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.