ICP 40VA Transformer for WFAR120D060C1 — 120V to 24V | Ships Today

Overview

This genuine OEM 40VA transformer (part number 1177217) supplies the 24-volt control circuit on the ICP / Tempstar / Heil WFAR120D060C1 furnace. It steps the incoming 120V line voltage down to the 24V needed to power the thermostat, gas valve, ignition control, and relays. When a transformer fails, the entire low-voltage side of the furnace goes dead — no thermostat display, no call for heat, and no response from the control board. A 40VA rating provides ample capacity for the furnace's combined 24V load.

Specifications

Compatibility

Built for the ICP WFAR120D060C1 and compatible Tempstar/Heil/Comfortmaker furnaces using a 120V primary, 24V secondary 40VA transformer. Verify your existing transformer is wired for 120V primary 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 every primary and secondary wire connection before disconnecting.
4. Remove — Disconnect the leads, unscrew the transformer from its mounting bracket, and remove it.
5. Install — Mount the new transformer and reconnect the primary (120V) and secondary (24V) leads exactly per your photo.
6. Test — Restore power, confirm 24V across the secondary, and verify the furnace responds to a heat call.

Signs You Need a Replacement

• No 24V at the thermostat or control board
• Thermostat screen is blank with line power present
• Repeated blown control fuses
• Burnt smell or scorched transformer housing

Shipping & Returns

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