ICP Transformer for WFMR090C048A1 — 40VA 120/24V | Ships Today

Overview

This is a genuine OEM low-voltage control transformer (part #1176944) for the ICP / Tempstar / Heil WFMR090C048A1 gas furnace. The transformer steps incoming 120V line voltage down to the 24V required to power the furnace control board, gas valve, thermostat, and other low-voltage components. A 40VA rating provides the current capacity needed to drive the control circuit and ignition sequence. When a transformer fails, the entire 24V control system goes dead — the furnace will not respond to thermostat calls, the control board shows no power, and nothing energizes. Common failure modes include an internal open winding, a shorted secondary from a wiring fault, or a popped internal fuse link after a control short.

Specifications

Compatibility

Engineered as a direct OEM replacement for the ICP Tempstar Heil WFMR090C048A1 furnace and other ICP-family models that use the same 40VA 120/24V control transformer. Always verify your existing transformer's VA rating and primary/secondary voltages before installing.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker; verify zero voltage with a multimeter.
2. Access — Remove the furnace blower or control compartment service panel.
3. Document — Photograph all primary and secondary wire connections before disconnecting.
4. Remove — Disconnect the 120V primary leads and the 24V secondary leads, then unbolt the failed transformer from its mounting bracket.
5. Install — Mount the new transformer, then reconnect the line and low-voltage leads exactly per your photo.
6. Test — Restore power and verify 24V at the secondary and a normal ignition sequence.

Signs You Need a Replacement

• No 24V power to the control board or thermostat
• Furnace completely unresponsive to thermostat calls
• Measured 0V on the secondary with 120V present on the primary
• Burnt smell or visibly scorched transformer housing

Shipping & Returns

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