ICP 40VA Transformer for WFSR080B048A2 — 120V to 24V | Ships Today

Overview

This OEM control transformer is built for the ICP/Tempstar/Heil WFSR080B048A2 gas furnace. It steps 120V line voltage down to the 24V control voltage that powers the thermostat, gas valve, control board, and relays. Rated at 40VA, it supplies the steady low-voltage current the entire control circuit depends on. When a transformer fails — often from a short, overload, or age — the furnace goes completely dead at the thermostat: no display, no call for heat, and no 24V at the board. Part number 1177217 is a direct OEM replacement that restores reliable control power.

Specifications

Compatibility

Direct-fit replacement for the ICP/Tempstar/Heil WFSR080B048A2 furnace and other ICP-family units specifying a 40VA, 120V-to-24V transformer. Verify your primary and secondary voltages match 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 every primary and secondary lead before disconnecting.
4. Remove — Unbolt the failed transformer from its bracket and disconnect the line and low-voltage wiring.
5. Install — Mount the new transformer, then reconnect the 120V primary and 24V secondary leads exactly per your photo.
6. Test — Restore power and confirm 24V across the secondary and a normal call for heat at the thermostat.

Signs You Need a Replacement

• Thermostat is blank and furnace is unresponsive
• No 24V measured at the control board or thermostat terminals
• Transformer is hot, buzzing, or has a burnt smell
• Repeatedly blown low-voltage fuse on the control board

Shipping & Returns

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