ICP Transformer for WFMR070A036B3 — 40VA 120/24V Control | Ships Today

Overview

This OEM control transformer (part number 1177217) is a 40VA unit with a 120V primary and a 24V secondary that powers the low-voltage control circuit of the ICP Tempstar Heil WFMR070A036B3 furnace. It supplies the 24V needed to run the control board, gas valve, igniter sequence, and thermostat. A failed transformer leaves the entire control side dead — no thermostat power, no ignition, and no blower call. Failures typically come from a shorted secondary circuit, voltage surges, or sustained overload that cooks the windings.

Specifications

Compatibility

A direct OEM replacement for the ICP Tempstar Heil WFMR070A036B3 furnace and compatible ICP-family models using a 40VA 120/24V control transformer. Always confirm the VA rating and primary/secondary voltages of your existing transformer 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/blower service panel.
3. Document — Photograph the primary and secondary wiring before disconnecting.
4. Remove — Disconnect the 120V primary and 24V secondary leads, then unbolt the old transformer from its bracket.
5. Install — Mount the new transformer and reconnect the primary and secondary leads exactly per your photo.
6. Test — Restore power, verify 24V at the secondary, and confirm a normal call for heat completes.

Signs You Need a Replacement

• Furnace is fully dead with no thermostat display or 24V control power.
• Low-voltage control fuse blows repeatedly.
• No 24V at the secondary despite 120V present at the primary.
• Burnt smell, melted housing, or scorch marks at the transformer.

Shipping & Returns

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