ICP 24V Control Transformer for WFML090C048A1 – 40VA Furnace Transformer | Ships Today
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Overview
This genuine OEM control transformer (ICP part number 1176944) supplies the 24-volt low-voltage power for the ICP / Heil / Tempstar WFML090C048A1 gas furnace. It steps the line-voltage primary down to a 24V secondary that energizes the thermostat, control board, gas valve, igniter circuit, and blower/inducer relays. When a transformer fails — typically from a shorted secondary, an overloaded accessory, or simple age — the furnace goes completely dead: no thermostat display, no call for heat, no blower. Replacing the transformer with the correct OEM part restores reliable 24V control power and protects the downstream control board.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1176944 |
| Type | Step-down Control Transformer |
| Brand | ICP (Heil / Tempstar / Comfortmaker) |
| Secondary Voltage | 24V |
| Rating | 40VA (typical furnace control rating) |
| Fitment | OEM replacement |
Compatibility
Built for the ICP/Heil/Tempstar WFML090C048A1 furnace and other WFML-series and ICP-family furnaces using the same 24V control transformer. Verify your existing transformer's primary voltage tap and VA rating against the unit wiring diagram before installing.
Installation Guide
- Safety First – Disconnect power at the furnace switch and breaker, then verify zero voltage at the transformer leads with a multimeter.
- Access – Remove the control/burner compartment service panel.
- Document – Photograph every primary and secondary wire and tap before disconnecting.
- Remove – Disconnect the line-voltage primary and 24V secondary leads, then unscrew the transformer from the panel.
- Install – Mount the new transformer, match the primary tap to your supply voltage, and reconnect the secondary per your photo.
- Test – Restore power, confirm 24V across the secondary, and run a heat call to verify normal operation.
Signs You Need a Replacement
- Furnace is completely dead with no thermostat display.
- No 24V present across the transformer secondary.
- Transformer is hot, buzzing loudly, or smells burnt.
- Repeated blown low-voltage fuse after clearing shorts.
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