OEM Carrier Control Transformer 40VA 208/240V to 24V for Model SUBCLR50HJ440080

This OEM control transformer (part# HT01BD209) is the factory-specified replacement for the Carrier SUBCLR50HJ440080 HVAC system. The transformer steps down line-voltage power (208/240V) to the 24V low-voltage signal used by your thermostat, control board, gas valve, and all other 24V components. When this transformer fails, the entire control circuit loses power — the result is a completely unresponsive system: no thermostat communication, no ignition sequence, and no heating or cooling operation. If your system is totally dead with no 24V at the control board, this transformer is the first part to test and replace.

• Specs: 40VA rating | 208/240V primary input | 24V secondary output | 50/60Hz | OEM part# HT01BD209 | Replaces HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: This OEM unit is factory-wound to exact VA and voltage tolerances. Under-rated or off-tolerance generic transformers can overheat, trip thermal cutoffs prematurely, or deliver unstable 24V — causing nuisance lockouts or damaging downstream controls.
• Install difficulty: 2/5 — Disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching terminals). Label or photograph all wire connections before removal. Wires connect to screw terminals — straightforward swap.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for Carrier model SUBCLR50HJ440080. Always verify your unit's data plate voltage requirements before ordering — some configurations may use 208V or 240V primary. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order. Order now and ship today.