OEM Carrier Control Transformer 208/230V 40VA — HT01CN241 for Model PF4MNA037000AAAA

This OEM Carrier transformer (part number HT01CN241) is the factory-specified replacement for the Carrier PF4MNA037000AAAA fan coil/air handler unit. The transformer steps down line voltage from 208/230V primary to a safe 24V secondary at 40VA, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, nothing in the system responds: the thermostat goes blank, the blower won't energize, and no heating or cooling call is answered. It is often the first component to diagnose when a system appears completely dead despite line voltage being present at the unit.

• Specs: 208/230V primary | 24V secondary | 40VA power rating | Direct OEM replacement for Carrier part HT01CN241
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier. Undersized or off-spec generic units can cause nuisance fuse blows, control board damage, or intermittent lockouts — OEM is always the safer choice for the control circuit backbone.
• Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph all wiring connections before disconnecting. Confirm 24V output with a multimeter after installation before reassembling the panel.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day when ordered by 3 PM local time.

Compatibility: Engineered as a direct OEM replacement for the Carrier PF4MNA037000AAAA fan coil unit. Verify your unit's data plate shows a 208/230V primary and 24V/40VA control circuit before ordering. Not sure? Our HVAC parts specialists verify fitment before you buy — contact us today and get your system back online fast.