OEM Carrier 24V Control Circuit Transformer HT01CN241 for Model PF1MNC042000AAAA

This OEM step-down transformer is the factory-specified replacement for the Carrier PF1MNC042000AAAA fan coil unit. Its sole but critical job is to convert 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage relay coils throughout the system. When this transformer fails, nothing works — the thermostat goes dark, the contactor coil loses its signal, and the entire unit becomes unresponsive. It is one of the first components any technician checks on a completely dead system.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | OEM Part Number: HT01CN241 | Factory-matched VA rating for Carrier PF1MNC042000AAAA low-voltage control circuit
• OEM vs Generic: OEM transformers are wound to exact VA specifications, protecting sensitive control boards from under-voltage brown-outs and over-current surges that off-brand units commonly cause. Using the OEM part preserves your control board warranty.
• Install Difficulty: 2/5 — Power down and lock out the unit before any work. Tools needed: flathead and Phillips screwdriver, multimeter (verify 0V before touching secondary leads), wire nuts or push-in connectors. Photograph all wiring before disconnecting. Test secondary voltage output before re-energizing the full system.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cut-off ship same business day from our climate-controlled warehouse.

Compatibility: Designed and factory-matched for Carrier model PF1MNC042000AAAA fan coil units. Always verify primary/secondary voltage and VA rating on your existing transformer's data label before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you buy — no guesswork required.