ICP Transformer for WFMR070A024B3 — 40VA 120/24V | Ships Today

Overview

This is a genuine OEM control transformer (part number 1177217) for the ICP / Tempstar / Heil model WFMR070A024B3 gas furnace. Rated at 40VA with a 120V primary and 24V secondary, it supplies the low-voltage power that runs the thermostat, ignition control, gas valve, and relays. Without a working transformer the entire control circuit is dead — the furnace will not respond to a call for heat and the thermostat may go blank. A shorted transformer often buzzes, runs hot, scorches its windings, or repeatedly blows the low-voltage fuse, all sure signs it needs replacement.

Specifications

Compatibility

Engineered as the factory replacement for ICP, Tempstar, Heil, Comfortmaker, and Arcoaire furnaces in the WFMR series, this 40VA transformer is a direct fit for model WFMR070A024B3 and matches the original 120V-to-24V control specification.

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/blower compartment service panel.
3. Document — Photograph all primary (120V) and secondary (24V) connections before disconnecting.
4. Remove — Disconnect the leads and unbolt the transformer from its bracket.
5. Install — Mount the new transformer and reconnect line and 24V leads exactly per your photo.
6. Test — Restore power, confirm 24V at the secondary, and verify a normal heat call.

Signs You Need a Replacement

• Blank thermostat and no 24V control power
• Furnace unresponsive to a call for heat
• Audible buzzing or overheating transformer
• Repeatedly blown low-voltage control fuse

Shipping & Returns

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