OEM Carrier 40VA Control Transformer HT01CN241 for Model PF1MNB030005AAAA

This OEM control transformer (part number HT01CN241) is the factory-specified replacement for the Carrier PF1MNB030005AAAA fan coil unit. The transformer steps down 120V line voltage to the 24V signal voltage required by the control board, thermostat, and all low-voltage safety circuits. When this component fails, the entire low-voltage control circuit goes dead — the thermostat goes blank, the system ignores all calls for heating or cooling, and no contactors or relays energize. Replacing a faulty transformer is one of the most cost-effective repairs on any air handler or fan coil.

• Specs: 120V primary | 24V secondary | 40VA rating | Factory-matched output tolerance | Terminal or lead-wire connections
• OEM vs Generic: OEM transformers are wound and potted to Carrier's exact VA rating and insulation class. Generic units are often underrated in VA, causing thermal cutout trips under full load and premature failure of the low-voltage circuit.
• Install difficulty: 2/5 — Always switch off power at the breaker and verify zero voltage with a multimeter before disconnecting leads. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all wires before removal and confirm polarity on reinstall.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM fit for Carrier PF1MNB030005AAAA fan coil units. Always verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating against your unit's data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before your order ships — no guesswork required.