OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF4MNB043000ABAA

This is the genuine OEM Carrier replacement transformer (part# HT01CN241) factory-specified for the Carrier PF4MNB043000ABAA fan coil and air handler system. The transformer steps down 208/230V line voltage to the 24V AC signal that powers the entire low-voltage control circuit — thermostats, contactors, relay boards, and zone controls all depend on it. When this transformer fails, nothing in the control system responds: the thermostat goes dark, the system won't energize, and in some cases a blown fuse on the secondary side is the first clue. Replacing it with the correct OEM unit restores full factory control circuit performance immediately.

• Specs: 208/230V Primary | 24V Secondary | 40VA Rating | Direct wire leads | Factory-matched to Carrier tolerances
• OEM vs Generic: The OEM HT01CN241 is wound to Carrier's exact VA and impedance specification. Generic 40VA transformers vary widely in secondary voltage regulation under load, which can cause erratic thermostat behavior and nuisance trips on sensitive control boards.
• Install difficulty: 2/5 — Shut off power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Always confirm secondary output reads 24–28V AC under no-load before reconnecting controls. Photograph existing wiring before disconnecting leads.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.

Compatibility: Designed as the direct OEM replacement for Carrier model PF4MNB043000ABAA. Also cross-applies to select ICP, Heil, and Tempstar fan coil platforms sharing the HT01CN241 specification. Always verify your unit's data plate shows a 208/230V primary / 24V secondary / 40VA transformer before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence and receive fast same-day shipping.