OEM Carrier Control Transformer 40VA for Model C4850C50Z2050600

This OEM control transformer (part# HT01BD236) is the factory-specified replacement for the Carrier C4850C50Z2050600 packaged unit. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When it fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any inputs, and nothing runs. A shorted transformer will often trip or blow the low-voltage fuse as well, so always inspect the fuse and wiring for downstream shorts before installing a replacement.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Factory-matched output tolerance for reliable low-voltage control
• OEM vs Generic: This OEM transformer is wound to Carrier's exact VA and voltage specifications. Undersized or off-tolerance generic transformers can overheat under load, trip thermal cutoffs prematurely, and cause erratic thermostat or board behavior.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all wires before disconnecting. Confirm 24V output at secondary terminals before reassembly.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C4850C50Z2050600 packaged unit. Cross-reference your existing transformer's VA rating, primary voltage, and secondary voltage against your unit's data plate before ordering. If you're unsure about fitment, our HVAC parts specialists can verify compatibility before you buy — orders placed before 3 PM ship the same day.