OEM Carrier 40VA Control Transformer HT01CN241 for Model PF1MNC042T00AAAA

This OEM step-down transformer is the factory-specified replacement for the Carrier PF1MNC042T00AAAA fan coil unit. It steps 120V primary voltage down to the 24V secondary voltage that powers your entire control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the system goes completely unresponsive: the thermostat goes blank, contactors won't energize, and no heating or cooling function is possible. A blown fuse on the secondary side is often the first clue that this component has failed.

• Specs: 120V primary | 24V secondary | 40VA rated | Direct OEM replacement | Part number HT01CN241
• OEM vs Generic: OEM transformers are wound to exact VA ratings with factory-spec insulation and thermal protection. Generic alternatives frequently drift under load, delivering under-voltage to the control circuit and causing erratic or intermittent system behavior.
• Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Always verify 24V output on the secondary side before reconnecting the control circuit. Photograph or label all wiring before disconnecting.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed and verified for the Carrier PF1MNC042T00AAAA fan coil unit. Confirm primary voltage (120V) on your unit's data plate before ordering. Need help verifying fitment? Our HVAC parts specialists confirm compatibility before you buy — no guesswork, no returns.