OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF1MNB036008AAAA

This is the factory OEM replacement control transformer for the Carrier PF1MNB036008AAAA fan coil / air handler unit, sold under OEM part number HT01CN241. The transformer steps down 208/230V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dead — the thermostat goes blank, the system stops responding to calls for heating or cooling, and no contactors, relays, or valve solenoids can be energized. A failed transformer is often mistaken for a thermostat or control board failure, making correct diagnosis critical before replacing more expensive components.

• Specs: 40VA rating | 208/230V primary input | 24V AC secondary output | 50/60 Hz | Factory-matched Carrier OEM part HT01CN241
• OEM vs Generic: OEM transformers are manufactured to exact Carrier factory specifications for winding tolerance, VA output stability, and thermal protection — generic alternatives frequently underperform under high-demand load cycles, risking control board damage and nuisance lockouts.
• Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to confirm 24V output post-install). Label and photograph all low-voltage wiring before disconnecting. Re-energize and verify 24–28V AC at secondary terminals before reassembly.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day when ordered by 5 PM local time.

Compatibility: Designed as a direct OEM replacement for the Carrier PF1MNB036008AAAA fan coil unit. Always verify primary voltage (208V or 230V) from your unit's data plate matches your supply circuit before installation. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order — reach out via chat or phone.