OEM Carrier Control Transformer 208/230V 40VA for Model PF1MNB018000AAAA

This OEM Carrier transformer (part #HT01CN241) is the factory-specified 40VA step-down transformer for the Carrier PF1MNB018000AAAA fan coil and air handler series. Its primary job is to step line voltage down from 208/230V to a safe 24V AC, powering the thermostat signal wiring, control board, and all low-voltage switching in the system. When the transformer fails, nothing in the control circuit works — the thermostat goes dark, contactors don't energize, and the system produces no heating or cooling response whatsoever.

• Specs: 208/230V Primary | 24V Secondary | 40VA Power Rating | Direct OEM drop-in replacement for Carrier part #HT01CN241
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerance specs. Undersized or off-tolerance aftermarket transformers can overheat, blow fuses, or damage control boards — stick with OEM for a part this critical.
• Install Difficulty: 2/5 — Always shut off power at the breaker and verify zero voltage with a multimeter before touching wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all 24V secondary wires before disconnecting the old unit.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for Carrier model PF1MNB018000AAAA fan coil and air handler units. Verify your unit's data plate shows a 208/230V primary and 24V secondary requirement before ordering. Our fitment team is available to confirm compatibility — reach out before you order if you're unsure.