OEM Carrier 40VA Control Transformer HT01CN241 for Model FX4CNF036T00AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FX4CNF036T00AAAA fan coil unit. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching components. When this part fails, the entire control circuit goes dead — the thermostat goes blank, the system will not respond to any calls for heating or cooling, and no safety or sequencing functions operate. It is one of the first components to check when a system shows zero response despite power being confirmed at the unit.

• Specs: 40VA rating | 120V primary / 24V secondary | Hardwired lead connections | Factory-matched to Carrier FX4CNF036T00AAAA control circuit requirements
• OEM vs Generic: This is a genuine OEM Carrier transformer, manufactured to exact VA and voltage tolerances. Generic transformers can run underrated VA loads, causing thermal overload, blown fuses, and premature control board failure downstream.
• Install difficulty: 2/5 — Always shut off power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper, wire nuts. Verify 24V output with a multimeter after installation before restoring low-voltage wiring. Check for a blown low-voltage fuse on the control board, as a shorted transformer often blows it simultaneously.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our in-stock warehouse inventory.

Compatibility: Designed specifically for the Carrier FX4CNF036T00AAAA fan coil unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. If you have questions about fitment, our HVAC parts specialists confirm compatibility before your order ships — same day on all in-stock items.