OEM Carrier Control Transformer 40VA 208/230V–24V for Model PF1MNB036010AAAA

This is the genuine OEM Carrier replacement control transformer (part number HT01CN241) for the Carrier PF1MNB036010AAAA fan coil and air handler unit. The transformer steps down the 208/230V line-voltage power supply to the 24V AC signal that energizes your thermostat, control board, contactors, and all low-voltage safety circuits. When this transformer fails, the entire control circuit goes dark — the system will not respond to thermostat calls, the display may go blank, and no heating or cooling function will operate. If you're measuring 0V at the 24V secondary terminals with line voltage confirmed at the primary, this transformer is almost certainly the cause.

• Specs: 208/230V primary input | 24V AC secondary output | 40VA power rating | Factory-matched Basler Electric design | Direct plug-in replacement, no wiring modifications required
• OEM vs Generic: OEM transformers are wound to exact VA tolerances and insulation class ratings. Undersized generic transformers can overheat, trip their internal thermal fuse, or fail to supply adequate current to modern multi-stage control boards — causing intermittent lockouts that are difficult to diagnose.
• Install difficulty: 2/5 — Always shut off the main disconnect and verify zero voltage before starting. Tools needed: multimeter, flathead and Phillips screwdrivers, wire nuts or quick-connect terminals. Label all low-voltage wires before disconnecting. Confirm 24V output at secondary terminals after installation before restoring full system power.
• Warranty: 1-year OEM manufacturer's warranty. In-stock units ship the same business day when ordered before cutoff.

Compatibility: Designed as the factory-specified replacement transformer for the Carrier PF1MNB036010AAAA fan coil unit. Verify your unit's data plate shows a 208/230V primary and 24V/40VA control circuit before ordering. Our parts specialists are available to confirm fitment — reach out before you order if you have any questions. Order now and we'll ship today.