OEM Carrier Control Transformer 40VA 208/230V–24V for Model PF1MNB018008AAAA

This OEM control transformer (part number HT01CN241) is the factory-specified replacement for the Carrier PF1MNB018008AAAA fan coil and air handler unit. The transformer steps line voltage (208/230V primary) down to the 24V signal voltage that powers the entire low-voltage control circuit — including your thermostat, zone valves, and contactor coil. When it fails, nothing in the system responds: the thermostat goes blank, the unit won't call for heating or cooling, and the contactor coil remains de-energized. A failed transformer is one of the most commonly misdiagnosed HVAC faults — before replacing a control board, always verify 24V output at the transformer secondary.

• Specs: 208/230V primary | 24V secondary | 40VA power rating | Direct OEM drop-in replacement for part number HT01CN241
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part, manufactured to exact voltage regulation and thermal tolerance specifications. Generic transformers often run outside tolerance, causing nuisance lockouts, erratic thermostat behavior, and premature contactor coil failure.
• Install difficulty: 2/5 — Disconnect power at the breaker and confirm zero voltage before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output after installation), wire labels or tape. Always photograph and label all low-voltage wiring connections before disconnecting.
• Warranty: 1-year OEM manufacturer warranty. In stock — ships same business day when ordered by 3PM local time.

Compatibility: Direct OEM replacement for Carrier model PF1MNB018008AAAA. Verify your unit's data plate shows a 208/230V primary and 24V secondary control circuit before ordering. Compatible across Carrier fan coil and air handler platforms using the HT01CN241 specification. Our parts specialists can confirm fitment before you order — contact us anytime.