OEM Carrier 75VA Control Transformer HT01BD236 for Model PH1SEA090000AAAA

This OEM Carrier control transformer (part #HT01BD236) is the factory-specified replacement for the Carrier PH1SEA090000AAAA packaged heat pump unit. The transformer steps high-voltage primary power — 200/230/460V — down to a safe 24V AC secondary output that energizes the entire low-voltage control circuit: thermostat, contactor coil, reversing valve, and safety controls. When the transformer fails, the result is typically a completely unresponsive system — the thermostat goes dark, nothing calls for heating or cooling, and the unit sits completely dead. A blown transformer is often caused by a shorted wire, a stuck contactor coil, or a control board fault — always diagnose the root cause before replacing.

• Specs: 75VA rating | Primary: 200/230/460V multi-tap | Secondary: 24V AC | Class 2 | 50/60 Hz | Factory OEM part #HT01BD236
• OEM vs Generic: This is the genuine Carrier OEM transformer, manufactured to exact factory VA rating and impedance tolerances. Generic alternatives risk nuisance tripping, under-voltage to controls, or premature failure due to looser VA and thermal ratings.
• Install difficulty: 3/5 — Always shut off power at the disconnect and breaker before servicing. Tools needed: multimeter, flat-head and Phillips screwdrivers, wire stripper, needle-nose pliers. Label all 24V wiring before disconnecting. Verify primary tap matches your supply voltage. Check for downstream shorts before energizing.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse — order by 3PM local time for same-day dispatch.

Compatibility: Designed for Carrier model PH1SEA090000AAAA packaged heat pump units. Also replaces legacy part numbers HT01BD235, HT01AX050, HT01BZ236, P541-7702, P541-7703, 305398-701, 15B0002N02, and 15B0002N05. Confirm your unit's supply voltage and verify the correct primary tap before installation. Not sure this is your part? Our HVAC parts specialists verify fitment before you order — call or chat today.