ICP 40VA Transformer for WFEL090B024A1 — 120/24V | Ships Today

Overview

This OEM 40VA control transformer (part #1177217) steps 120V line voltage down to 24V to power the low-voltage control circuit of the ICP / Tempstar / Heil WFEL090B024A1 furnace. The transformer energizes the thermostat, control board, relays, gas valve, and contactor circuits. When a transformer fails — usually from a shorted control wire, a stuck relay drawing excess current, or simple age — the entire 24V system goes dead: no thermostat display, no call for heat or cool, and no system response. A burnt-smelling, discolored, or buzzing transformer is a clear sign of failure. This direct OEM replacement restores reliable 24V control power at the rated 40VA capacity.

Specifications

Compatibility

A direct OEM replacement for the ICP, Tempstar, Heil, and Comfortmaker family WFEL090B024A1 furnace. Confirm the primary voltage matches your supply (120V) and that the part number reads 1177217 before installing.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the furnace control compartment service panel.
3. Document — Photograph the primary (line) and secondary (24V) wire connections before disconnecting.
4. Remove — Disconnect the leads and unbolt the failed transformer from its mounting bracket.
5. Install — Mount the new transformer, reconnect primary to 120V and secondary to the 24V common/R circuit per your photo.
6. Test — Restore power and confirm 24V across the secondary terminals and normal system startup.

Signs You Need a Replacement

• Blank thermostat with no 24V control power
• System completely unresponsive to a call for heat or cool
• Burnt smell or visible scorching on the transformer body
• Audible buzzing or repeatedly blown low-voltage fuse

Shipping & Returns

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