ICP Transformer for WFML110C066A1 — 40VA 120/24V | Ships Today
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Overview
This OEM control transformer (part #1176944) is a direct replacement for ICP Tempstar Heil furnace model WFML110C066A1. It steps the incoming 120V line voltage down to the 24V control voltage that powers the thermostat, gas valve, igniter circuit, and control board. A failed transformer is one of the most common reasons a furnace goes completely dead — no thermostat display, no blower, no ignition sequence. Rated at 40VA, it supplies ample control current for the entire low-voltage circuit. Symptoms of failure include a blank thermostat, a buzzing or humming transformer, a burnt smell at the control box, or a blown low-voltage fuse that keeps recurring.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1176944 |
| Type | Control Transformer |
| Brand | ICP / Tempstar / Heil |
| Rating | 40 VA |
| Primary Voltage | 120V |
| Secondary Voltage | 24V |
| Fit | OEM Direct Replacement |
Compatibility
Engineered for ICP Tempstar Heil model WFML110C066A1 and shared across many ICP-family gas furnaces and air handlers using the same 40VA 120/24V control platform (Comfortmaker, Arcoaire, KeepRite). Always confirm the printed VA and voltage on your existing transformer before installing.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
- Access — Remove the furnace control/burner service panel.
- Document — Photograph all primary (120V) and secondary (24V) wire connections before disconnecting.
- Remove — Disconnect the line and low-voltage leads, then unbolt the transformer from the control bracket.
- Install — Mount the new transformer, reconnect primary and secondary leads exactly per your photo, and confirm the ground.
- Test — Restore power and verify 24V across the secondary terminals and a normal call-for-heat sequence.
Signs You Need a Replacement
- Blank or dead thermostat with no display
- Furnace completely unresponsive to a call for heat
- Repeatedly blown 3A or 5A low-voltage fuse
- Audible buzzing, humming, or a burnt smell from the transformer
Shipping & Returns
Ships same day on orders placed before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days