OEM Carrier Transformer 40VA 120V/24V for Model PF1MNB030008AAAA

This OEM step-down transformer (part number HT01CN241) is the factory-specified replacement for the Carrier PF1MNB030008AAAA fan coil unit. The transformer steps line voltage (120V primary) down to 24V AC to power the low-voltage control circuit — including the thermostat, control board, and all 24V relays. When it fails, the entire control circuit goes dead: the thermostat displays nothing, the system won't respond to any input, and no components will energize. Replacing the transformer is typically the first diagnostic step when the 24V circuit shows zero voltage at the secondary terminals.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory-matched output tolerance | OEM part number HT01CN241
• OEM vs Generic: This OEM unit is wound to exact Carrier factory specifications. Generic transformers frequently carry lower VA ratings or looser voltage tolerances, which can cause intermittent control faults, nuisance lockouts, or premature control board failures due to voltage sag under load.
• Install difficulty: 2/5 — Disconnect power at the breaker before any work. Tools needed: flat-head and Phillips screwdrivers, multimeter (verify 0V before touching terminals), wire nuts or terminal connectors. Label all low-voltage wires before disconnecting.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier PF1MNB030008AAAA fan coil unit. Always verify primary voltage (120V) and VA rating on your unit's data plate before ordering. Our technical team is available to confirm fitment — contact us before placing your order if you have any questions.