ICP 40VA Transformer for WFAR080B048B1 — 120/24V OEM 1177217 | Ships Today

Overview

This genuine OEM 40VA control transformer (part number 1177217) supplies the low-voltage power for the ICP WFAR080B048B1 gas furnace. It steps the 120V line voltage down to the 24V used by the thermostat, control board relays, gas valve, and safety circuits. Rated at 40VA, it provides enough capacity to drive the furnace controls plus a typical air-conditioning contactor on the same low-voltage circuit. When a transformer fails — usually from a shorted thermostat wire, a stuck contactor, or simple age — the entire 24V system goes dead: no thermostat display, no ignition, and no cooling. A failed transformer often smells burnt or shows a blown internal fuse link. Replacing it restores low-voltage power to the whole system.

Specifications

Compatibility

Direct OEM replacement for the ICP WFAR080B048B1 furnace and other ICP-family units (Heil, Tempstar, Comfortmaker, Arcoaire, KeepRite) that use the 40VA 120-to-24V transformer 1177217. Verify the VA rating and voltage taps on your existing transformer before installing.

Installation Guide

1. Safety First — Disconnect power at the switch and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the furnace control-area service panel.
3. Document — Photograph the primary and secondary wire connections before disconnecting.
4. Remove — Disconnect the leads, remove the mounting screw or bracket, and take out the old transformer.
5. Install — Mount the new transformer and reconnect 120V to the primary and 24V to the secondary per your photos.
6. Test — Restore power and confirm 24V at the secondary and normal thermostat operation.

Signs You Need a Replacement

• No 24V power — dead thermostat and no furnace response.
• Burnt smell or discoloration on the transformer.
• Open winding or no secondary output when measured.
• Repeated blown low-voltage fuse after replacing other parts.

Shipping & Returns

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