ICP Transformer for WFMR045A024A1 — 40VA 120/24V Control Transformer | Ships Today

Overview

This OEM control transformer (part #1176944) steps down 120V line voltage to the 24V control signal that runs your ICP, Tempstar, and Heil furnace or air handler. Rated at 40VA, it powers the thermostat circuit, gas valve, ignition control, and relays. When a transformer fails, the entire low-voltage control system goes dead — the thermostat screen blanks, the blower won't start, and no heating or cooling call is answered. A buzzing transformer, a tripped or blown low-voltage fuse, or a melted/burnt smell at the control box are classic signs of an overloaded or shorted unit. This is a direct factory replacement built to the original specification.

Specifications

Compatibility

Designed for ICP family equipment including model WFMR045A024A1 and other Tempstar, Heil, and Comfortmaker furnaces and air handlers that use a 40VA 120/24V control transformer. Always confirm the primary voltage and VA rating against the failed unit before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
2. Access — Remove the furnace or air handler service panel.
3. Document — Photograph all primary and secondary wire connections before disconnecting.
4. Remove — Disconnect the primary (line) and secondary (24V) leads, then unbolt the old transformer from the control panel.
5. Install — Mount the new transformer, reconnect primary and secondary leads exactly per your photo, and confirm the correct voltage tap.
6. Test — Restore power and verify 24V across the secondary terminals and a normal control response.

Signs You Need a Replacement

• No 24V output / dead thermostat and controls
• Repeatedly blown low-voltage fuse
• Audible buzzing or humming from the transformer
• Burnt smell or visible scorching at the control box

Shipping & Returns

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