ICP 24V Transformer for WAMC30004A1 — 40VA Control Transformer | Ships Today

Overview

This is a genuine OEM 24-volt control transformer (part number 202300900212) for the ICP Tempstar Heil WAMC30004A1 air handler. The transformer steps down incoming line voltage to the 24V control voltage that powers your thermostat, contactor coil, relays, and safety controls. A 40VA rating provides the secondary current needed to energize these low-voltage components reliably. When a control transformer fails, the entire low-voltage control circuit goes dead: the thermostat screen goes blank, the contactor will not pull in, and the system will not respond to a call for cooling or heating. Common failure causes include a shorted thermostat wire, a seized contactor coil that overloads the secondary winding, voltage spikes, and simple age-related insulation breakdown.

Specifications

Compatibility

Engineered as the direct OEM replacement for the ICP Tempstar Heil WAMC30004A1. ICP also manufactures equipment under the Comfortmaker, Arcoaire, and KeepRite labels, so this transformer fits matching control assemblies across those families. Always confirm the printed part number on your existing transformer before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and disconnect switch, then verify zero voltage with a multimeter on both line and load terminals.
2. Access — Remove the unit service panel to expose the control box and transformer mounting bracket.
3. Document — Photograph every wire and terminal connection before disconnecting anything.
4. Remove — Label and disconnect the primary (line) and secondary (24V) leads, then unscrew the transformer from its mounting bracket or control panel.
5. Install — Mount the new transformer, reconnect the primary and secondary leads exactly per your photo, and confirm all spade connections are tight.
6. Test — Restore power and verify 24V across the secondary terminals with your multimeter and that the thermostat and contactor respond.

Signs You Need a Replacement

• Blank thermostat display with confirmed line voltage at the unit
• Contactor will not energize on a call for cooling
• No measurable 24V at the secondary terminals
• Burnt smell or visible scorching on the transformer body

Shipping & Returns

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