OEM Carrier 40VA Control Transformer HT01BD236 for Model PH1SPA090000AAAA

This OEM control transformer (part number HT01BD236) is the factory-specified replacement for the Carrier PH1SPA090000AAAA packaged heat pump unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, contactor coils, and control board. When this part fails, the entire control circuit goes dark — thermostats become unresponsive, contactors won't pull in, and the unit will not heat or cool regardless of demand.

• Specs: 40VA rated | 120V primary / 24V secondary | Direct OEM replacement | Factory-matched terminals for plug-and-play installation
• OEM vs Generic: OEM transformers from Carrier are wound to exact VA and voltage tolerances, protecting downstream control boards and contactors. Generic units with loose VA ratings can cause nuisance tripping or undervoltage faults that shorten board life.
• Install Difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output post-install), wire stripper. Note wire colors and terminal positions before disconnecting the old unit.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PH1SPA090000AAAA packaged heat pump unit. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions.