ICP Transformer 40VA 120/24V for WFSR080B048A1 — Furnace Control Power | Ships Today

Overview

This OEM control transformer (part number 1177217) steps the incoming 120V line voltage down to the 24V required by the low-voltage control circuit in your ICP/Heil/Tempstar WFSR080B048A1 furnace. Rated at 40VA, it supplies steady power to the thermostat, control board, gas valve, and relays. A failed transformer is one of the most common causes of a completely dead furnace — when it burns out, the thermostat goes blank and nothing energizes. Symptoms of failure include no 24V at the control board, a blown low-voltage fuse that keeps recurring, a buzzing or scorched transformer body, or intermittent operation when the unit warms up.

Specifications

Compatibility

Direct OEM replacement for ICP, Heil, Tempstar, Comfortmaker, and Carrier-family gas furnaces using model WFSR080B048A1 and related WFSR-series air handlers and furnaces that call for a 40VA 120-to-24V transformer.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage at the control board with a multimeter.
2. Access — Remove the furnace service panel to expose the control area.
3. Document — Photograph all primary (line) and secondary (24V) wire connections before disconnecting.
4. Remove — Disconnect the transformer leads, then unbolt or unclip the transformer from its mounting bracket.
5. Install — Mount the new transformer, reconnect line voltage to the primary and 24V leads to the secondary exactly per your photo.
6. Test — Restore power and confirm 24V across the secondary terminals and normal call-for-heat operation.

Signs You Need a Replacement

• No 24V reading at the control board or thermostat
• Repeatedly blown low-voltage fuses
• Buzzing, humming, or burnt smell from the transformer
• Furnace dead with no display at the thermostat

Shipping & Returns

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