ICP Transformer for WPH4484000RKA1 — 40VA 24V | Ships Today

Overview

This genuine OEM 24V control transformer assembly (parts 1176148 and 1172619) is the factory replacement for the ICP / Tempstar / Heil WPH4484000RKA1 heat pump. The transformer steps line voltage down to the 24-volt class 2 power that energizes the contactor coil, reversing valve solenoid, and low-voltage control circuit. Rated at 40VA, it supplies the steady control power the outdoor board and the reversing valve coil need to switch the system between heating and cooling. A shorted or open transformer kills all low-voltage operation — the thermostat goes dark, the contactor won't pull in, and the unit appears completely dead. Replacing it restores 24V control power and normal heat-pump operation.

Specifications

Compatibility

Engineered as the direct replacement for the ICP WPH4484000RKA1 heat pump condensing unit. Because ICP builds for several brands, these components also service equivalent Tempstar, Heil, Comfortmaker, and Arcoaire outdoor units originally equipped with parts 1176148 and 1172619. Confirm the secondary voltage and VA rating against your existing transformer before installing.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage at the transformer with a multimeter.
2. Access — Remove the service panel to reach the electrical control box.
3. Document — Photograph the primary and secondary lead connections and the reversing valve coil wiring before disconnecting.
4. Remove — Label and disconnect the leads, then unbolt the transformer from the control panel.
5. Install — Mount the new transformer, reconnect the primary to line voltage and the secondary to the 24V circuit per your photo.
6. Test — Restore power and confirm 24V across the secondary, then verify the contactor and reversing valve respond to a thermostat call.

Signs You Need a Replacement

• Thermostat is blank and the system is completely unresponsive.
• No 24V measured across the transformer secondary.
• Contactor and reversing valve won't energize on a call for heat or cool.
• Transformer is hot, buzzing, or has a burnt smell.

Shipping & Returns

Ships same day on orders placed before 3 PM CST. 30-day returns on unused parts. Backed by the National HVAC Parts fitment guarantee.