ICP 24V 40VA Transformer for WAMA24004A1 — Class 2 Control Transformer | Ships Today

Overview

This genuine OEM 24V control transformer is the factory replacement for the ICP/Tempstar/Heil WAMA24004A1 system. A control transformer steps the incoming line voltage down to the 24V Class 2 power that runs the thermostat, contactor coil, relays, and safety controls. When a transformer fails, the low-voltage circuit goes dead: the thermostat screen blanks, the contactor will not pull in, and the system makes no attempt to start even though line voltage is present. Rated at 40VA, this transformer supplies ample power for the unit's control circuit and is a frequent failure point after a control-circuit short or power surge. Replacing it restores low-voltage control to the entire system.

Specifications

Compatibility

Built as the direct OEM replacement transformer for the ICP/Tempstar/Heil WAMA24004A1. As a standard 24V 40VA Class 2 control transformer, it also serves as a common service replacement across comparable ICP-family residential units. Verify the secondary voltage (24V) and VA rating on your existing transformer before installing.

Installation Guide

1. Safety First — Disconnect power at the disconnect and verify zero voltage with a multimeter on both line and low-voltage terminals.
2. Access — Remove the service panel to expose the control box and transformer.
3. Document — Photograph all primary (line) and secondary (24V) wire connections before disconnecting.
4. Remove — Disconnect the leads, remove the mounting screw or bracket, and lift out the failed transformer.
5. Install — Mount the new transformer and reconnect primary and secondary leads exactly per your photo.
6. Test — Restore power and confirm 24V at the secondary and normal thermostat/contactor operation.

Signs You Need a Replacement

• Thermostat is blank or unresponsive with line power present.
• Contactor will not energize when there is a call for cooling.
• No measurable 24V across the transformer secondary terminals.
• Burnt smell or visible scorching on the transformer body after a short.

Shipping & Returns

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