ICP 40VA Transformer 120/24V for WFAR100C048C1 — Furnace Control Transformer | Ships Today
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Overview
This OEM 40VA control transformer (part 1177217) steps line voltage down from 120V to 24V to power the low-voltage control circuit on the ICP/Tempstar/Heil WFAR100C048C1 furnace. The 24V output feeds the thermostat, control board, gas valve, relays, and contactor coil — essentially the entire control system. When a transformer fails or shorts (often after a wiring fault or surge), the thermostat goes blank, the furnace won't respond to a heat or cool call, and no control voltage is present. A 40VA rating provides enough capacity for the furnace's control loads with margin. Installing the exact OEM transformer ensures correct VA capacity, primary/secondary voltages, and mounting fit.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1177217 |
| Type | Control Transformer |
| Brand | ICP / Tempstar / Heil |
| Rating | 40VA |
| Primary Voltage | 120V |
| Secondary Voltage | 24V |
| Fit | OEM Direct Replacement |
Compatibility
Designed for the ICP/Tempstar/Heil WFAR100C048C1 furnace and shared ICP-family platforms (Comfortmaker, Heil, Tempstar). Verify the 120V primary, 24V secondary, and 40VA rating against your existing transformer before installing.
Installation Guide
- Safety First — Disconnect power at the switch and breaker; verify zero voltage with a multimeter.
- Access — Remove the control compartment / service panel.
- Document — Photograph the primary and secondary wiring and note each wire color and terminal.
- Remove — Disconnect the leads, unbolt the old transformer from the bracket, and remove it.
- Install — Mount the new transformer, connect the 120V primary leads and 24V secondary leads per your photo, and secure all connections.
- Test — Restore power, confirm 24V across the secondary with a multimeter, and verify the thermostat and furnace respond to a call.
Signs You Need a Replacement
- Blank thermostat with no low-voltage power
- Furnace won't respond to heat or cool calls
- No 24V reading across the transformer secondary
- Burnt smell, discoloration, or repeatedly blown control fuse
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