OEM Payne 40VA Transformer for Model PA1SEA090000AAAA — Part# HT01BD236

This OEM replacement transformer (part number HT01BD236) is the factory-specified step-down transformer for the Payne PA1SEA090000AAAA air handler. The transformer converts 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any commands, and no heating or cooling operation is possible. It is often the first component to inspect when a system shows absolutely no signs of life despite confirmed line voltage at the unit.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory-matched windings | Meets original equipment electrical tolerances for the PA1SEA090000AAAA platform
• OEM vs Generic: OEM transformers from Payne use windings rated to exact VA and voltage tolerances. Generic alternatives frequently under-deliver on VA output, causing nuisance trips, board lockouts, and premature contactor coil wear due to voltage sag under load.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph existing wire connections before removing the old transformer. Verify 24V output with a multimeter after installation before restoring full system power.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock units ship same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Payne PA1SEA090000AAAA air handler. Always confirm primary voltage, secondary voltage, and VA rating on your unit's data plate or existing transformer label before ordering. Our parts specialists are available to verify fitment — order with confidence and get your system back online fast.