ICP Transformer for WFML110C048A1 — 40VA 120/24V | Ships Today
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Overview
This OEM control transformer (part #1176944) is the power-step-down component for your ICP Tempstar Heil WFML110C048A1 furnace. It converts incoming 120V line voltage down to the 24V low-voltage control signal that runs your thermostat, gas valve, ignition control, and relays. Rated at 40VA, it supplies enough current to energize the entire low-voltage control circuit. When a transformer fails, the furnace goes completely unresponsive — no thermostat display, no blower, no ignition — because the 24V control circuit has lost power. Failures are commonly caused by a shorted control wire, a stuck contactor, or simple age-related winding breakdown.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1176944 |
| Type | Control Transformer |
| Brand | ICP (Tempstar / Heil) |
| Rating | 40 VA |
| Primary Voltage | 120V |
| Secondary Voltage | 24V |
| Fit | OEM Replacement |
Compatibility
Engineered as a direct OEM fit for the ICP Tempstar Heil WFML110C048A1 furnace. This transformer is also used across many ICP-family gas furnaces (Tempstar, Heil, Comfortmaker) that require a 40VA 120-to-24V control transformer. Always confirm your existing transformer's VA and voltage rating against this part before ordering.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker; verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the furnace control/blower service panel.
- Document — Photograph all primary (line) and secondary (24V) wire connections before disconnecting.
- Remove — Disconnect the line and low-voltage leads, then unbolt the failed transformer from its mounting bracket.
- Install — Mount the new transformer, reconnect primary and secondary leads exactly per your photo, and secure all spade/screw terminals.
- Test — Restore power and confirm 24V across the secondary terminals and a normal thermostat startup.
Signs You Need a Replacement
- Thermostat is blank or dead with no 24V present at the control board.
- Furnace will not respond to any call for heat.
- Repeatedly blown low-voltage fuse on the control board.
- No measurable 24V output across the secondary terminals.
Shipping & Returns
Ships same day 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