ICP Transformer 40VA 120/24V for WFSR100C060A2 — 40VA | Ships Today

Overview

This is a genuine OEM 40VA control transformer (part number 1177217) for the ICP/Tempstar/Heil WFSR100C060A2 furnace. The transformer steps line voltage (120V) down to the 24V control voltage required to power the thermostat, gas valve, igniter circuit, and control board. A 40VA rating provides the load capacity needed to drive multiple low-voltage accessories simultaneously. When a transformer fails, the entire 24V control system goes dead — the thermostat shows no power, the furnace will not respond to a call for heat, and no sequencing occurs. Common causes of failure include a shorted thermostat wire, a seized blower or inducer motor drawing excess current, or simple age-related winding breakdown. Many transformers are protected by an internal thermal fuse or an external fuse on the control board; replacing a blown transformer without correcting the underlying short will only damage the new unit.

Specifications

Compatibility

Engineered for the ICP / Tempstar / Heil WFSR100C060A2 furnace and shared across many ICP-family models that use the 1177217 control transformer. Always confirm the existing transformer's VA rating and voltage taps 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 blower/control compartment service panel.
3. Document — Photograph all primary (line) and secondary (24V) wire connections before disconnecting.
4. Remove — Disconnect the line and low-voltage leads, then unbolt the failed transformer from its mounting bracket.
5. Install — Mount the new transformer, match the 120V primary taps and 24V secondary leads exactly per your photo.
6. Test — Restore power and confirm 24V at the secondary and a normal call-for-heat sequence.

Signs You Need a Replacement

• Thermostat is blank or unresponsive with line power present.
• No 24V output measured at the secondary terminals.
• Furnace does not start any heating sequence on a call for heat.
• Burnt smell or visible scorching on the transformer housing.

Shipping & Returns

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