ICP Transformer 40VA for WFAR120D060A1 – 120V to 24V Control Transformer | Ships Today

Overview

This OEM 40VA control transformer (part #1177217) supplies the low-voltage power that runs the entire 24V control circuit on your ICP WFAR120D060A1 furnace. It steps the incoming 120V line voltage down to the 24V needed by the thermostat, gas valve, igniter, and control board. A 40VA rating means it can deliver roughly 1.67 amps on the secondary side — enough headroom for standard furnace controls. When a transformer fails, the symptoms are unmistakable: a completely dead thermostat, no response when calling for heat, or a furnace that won't start at all despite having line power. Transformers commonly fail from a short on the secondary side, age, or a power surge, often after the internal fuse link opens.

Specifications

Compatibility

Designed as a direct OEM replacement for the ICP / Tempstar / Heil WFAR120D060A1 furnace. This 40VA 120-24V transformer is also used across many ICP family gas furnaces and air handlers that share the same control platform. Always verify the part number on your existing transformer before ordering.

Installation Guide

1. Safety First – Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter before touching any wiring.
2. Access – Remove the furnace control/blower compartment service panel.
3. Document – Photograph all primary (120V) and secondary (24V) wire connections before disconnecting anything.
4. Remove – Disconnect the line and low-voltage leads, then unbolt the failed transformer from its mounting bracket.
5. Install – Mount the new transformer, reconnect the 120V primary and 24V secondary leads exactly per your photo.
6. Test – Restore power, confirm 24V at the secondary with your meter, and run a heat cycle to verify operation.

Signs You Need a Replacement

• Thermostat screen is blank or completely dead
• Furnace does not respond to a call for heat
• No measurable 24V at the transformer secondary
• Repeated blown control fuses or a tripped internal link

Shipping & Returns

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