OEM Carrier 40VA Control Transformer (HT01CN001) for Model UPFLOW100U3619A

The Carrier HT01CN001 is the factory-specified 40VA step-down transformer for the UPFLOW100U3619A air handler. This critical component converts 120V line voltage down to the 24V AC signal that powers your entire control circuit — including the thermostat, contactor coil, zone boards, and any connected accessories. When this transformer fails, the system goes completely silent: no thermostat response, no blower, no heat or cool — nothing. Replacing it with the correct OEM unit ensures the control circuit operates at the exact voltage and current capacity the system was designed for.

• Specs: 40VA rating | 120V primary input | 24V secondary output | Direct OEM replacement for Carrier part number HT01CN001 | Factory tolerance matched
• OEM vs Generic: OEM transformers are wound and rated to Carrier's exact VA specification, preventing control board brownouts and nuisance tripping. Generic units often underrate their VA capacity, causing overheating and premature failure under full control-circuit load.
• Install Difficulty: 2/5 — Always shut off power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 24V output across secondary terminals after installation before restoring full power. Photograph all wiring connections prior to removal.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier UPFLOW100U3619A air handler. Always confirm your unit's control circuit voltage and VA demand from the data plate or wiring diagram before ordering. Our technical team is available to verify fitment — don't hesitate to reach out before you buy. Order today and receive same-day shipping on all in-stock OEM parts.