OEM Carrier 40VA Control Transformer 208/230V to 24V — HT01CN241 for Model PF4MNB037T00ABAA

This OEM Carrier control transformer (part# HT01CN241) is the factory-specified replacement for the Carrier PF4MNB037T00ABAA fan coil and air handler series. The transformer steps down 208/230V line voltage to the 24V AC signal that powers your thermostat, control board, zone valves, and all low-voltage control logic. When this transformer fails, the entire control circuit goes dark — the thermostat loses power, the system won't respond to calls for heating or cooling, and nothing turns on. It's often the first part to check when a system appears completely dead with no thermostat display.

• Specs: 40VA capacity | 208/230V primary input | 24V secondary output | 60Hz | Factory OEM fit and dimensions — direct drop-in, no modification needed
• OEM vs Generic: OEM transformers are wound to exact Carrier voltage and VA tolerances. Undersized or off-tolerance generic units can sag under full control-circuit load, causing nuisance lockouts, board resets, or premature component failure.
• Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, non-contact voltage tester. Label all low-voltage wires before disconnecting the old unit. The transformer typically mounts to the blower deck with two screws.
• Warranty: 1-year OEM manufacturer warranty included. In-stock units ship same business day from our warehouse.

Compatibility: Factory-matched for Carrier model PF4MNB037T00ABAA. Verify your unit's data plate confirms a 208/230V primary transformer before ordering — some configurations use a 120V primary (HT01CN236). Questions? Our HVAC parts team verifies fitment before you order — ships same day!