OEM Carrier 40VA Control Transformer HT01BD236 for Model C48A506052

This OEM replacement transformer (part number HT01BD236) is the factory-specified control circuit transformer for the Carrier C48A506052 packaged unit. The transformer steps down line voltage from 120V to the 24V signal required to power the thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dead — the thermostat loses power, no relays energize, and the system will not respond to any heating or cooling calls, even though line voltage may still be present at the unit.

• Specs: 40VA rated | 120V primary input | 24V secondary output | OEM part number HT01BD236 | Factory-matched for Carrier C48A506052 packaged units
• OEM vs Generic: This OEM transformer is wound to exact factory VA ratings and insulation class, ensuring stable 24V output under full control-circuit load. Generic transformers often under-deliver on VA capacity, causing voltage sag that triggers nuisance lockouts and premature control board failures.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 24V output with meter before restoring system power. Note wire colors and terminal labels before disconnecting old unit.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our warehouse.

Compatibility: Designed for the Carrier C48A506052 packaged unit. Always verify primary voltage (120V) and VA rating on your unit's wiring diagram or data plate before ordering. If your thermostat display is completely blank and your low-voltage fuse checks good, this transformer is the most likely culprit. Order with confidence — our team verifies fitment before your purchase ships.