ICP 24V Transformer for WAXA18004AT2 — 40VA Control Transformer | Ships Today

Overview

This OEM 24V control transformer (part number 202300900212) is the low-voltage power source for the control circuit on your ICP / Tempstar / Heil WAXA18004AT2 heat pump. It steps the incoming line voltage down to a 24-volt secondary that powers the thermostat, contactor coil, defrost board, and other 24V controls. Rated at 40VA, it supplies the steady control current the system needs to energize relays and sequence operation. When a transformer fails — usually from a shorted secondary, a voltage spike, or age — the entire 24V control circuit goes dead: the thermostat blanks, the contactor will not pull in, and the unit will not start even with high-voltage power present at the disconnect.

Specifications

Compatibility

Engineered as the factory replacement for the ICP, Tempstar, Heil, Comfortmaker, and Arcoaire WAXA18004AT2 heat pump. As the OEM component (202300900212) it matches the original primary/secondary voltages and mounting footprint exactly. Confirm your unit's line voltage and the printed part number on the existing transformer before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and the unit disconnect, then verify zero voltage with a multimeter before touching any wiring.
2. Access — Remove the service / control panel to expose the transformer and control board.
3. Document — Photograph every wire and terminal on the existing transformer before disconnecting anything.
4. Remove — Label and disconnect the primary (line) leads and the 24V secondary leads, then unbolt the transformer from its bracket.
5. Install — Mount the new transformer, match the primary leads to your line voltage tap, and reconnect the 24V secondary per your photo.
6. Test — Restore power and confirm 24 VAC across the secondary, then verify the thermostat powers up and the contactor energizes on a call for cooling.

Signs You Need a Replacement

• Thermostat screen is blank or dead with high-voltage power confirmed at the unit.
• No 24 VAC reading across the transformer secondary terminals.
• Contactor and controls will not energize on a call for heat or cool.
• Burnt smell, scorching, or a repeatedly blown low-voltage fuse at the transformer.

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.