ICP Transformer 40VA 120/24V for WFSR100C060A1 — 40VA | Ships Today

Overview

This is a genuine OEM 40VA control transformer (part number 1177217) for the ICP/Tempstar/Heil WFSR100C060A1 furnace. The transformer steps line voltage (120V) down to the 24V control voltage that powers the thermostat, gas valve, igniter circuit, and integrated control board. A 40VA rating supplies enough load capacity to drive multiple low-voltage components at once. When the transformer fails, the entire 24V control system loses power — the thermostat goes blank, the furnace will not answer a call for heat, and no ignition sequence begins. Typical failure causes include a shorted thermostat wire, a seized inducer or blower motor pulling excess current, or normal age-related winding breakdown. Many transformers include an internal thermal fuse or are protected by a board-mounted fuse; replacing a blown transformer without first correcting the underlying short will simply burn out the replacement.

Specifications

Compatibility

Engineered for the ICP / Tempstar / Heil WFSR100C060A1 furnace and shared across many ICP-family models that use the 1177217 control transformer. 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 and 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 begin 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.