ICP Transformer for WFML045A024A1 — 40 VA 120/24V OEM 1176944 | Ships Today

Overview

This genuine OEM control transformer (part number 1176944) steps the line voltage down to the 24V control voltage that powers the thermostat, gas valve, contactor coil, and control board on the ICP / Tempstar / Heil WFML045A024A1. A 40 VA transformer is the heart of the low-voltage circuit — when it fails, the system goes completely dead at the thermostat even though line power is present. Common failure causes include a shorted thermostat wire, a stuck contactor drawing excess current, or simple age-related winding breakdown.

Specifications

Compatibility

Designed for the ICP Tempstar Heil WFML045A024A1 and other ICP-family furnaces and air handlers using a 40 VA, 120V-to-24V control transformer. Verify your primary voltage tap and VA rating before installing.

Installation Guide

1. Safety First — Disconnect power and verify zero voltage with a multimeter on both primary and secondary leads.
2. Access — Remove the service panel to expose the control box.
3. Document — Photograph all primary and secondary wire connections before disconnecting.
4. Remove — Disconnect the leads, unbolt the transformer from the panel, and check for a tripped or fuse-protected secondary.
5. Install — Mount the new transformer, match primary leads to the correct line tap, and reconnect the 24V secondary per your photo.
6. Test — Restore power and confirm 24V (±10%) across the secondary terminals.

Signs You Need a Replacement

• No power at the thermostat with line voltage present
• System completely dead — no blower, ignition, or cooling call response
• 0V reading across the 24V secondary terminals
• Burnt smell, scorched windings, or a blown low-voltage fuse

Shipping & Returns

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