ICP Transformer for WFSR040A030A2 — 40VA 120/24V | Ships Today
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Overview
This OEM ICP control transformer (part #1177217) steps down 120V line voltage to the 24V control voltage required by your furnace or air handler's low-voltage circuit. Rated at 40VA, it powers the thermostat, gas valve, control board, contactors, and relays in the WFSR040A030A2 system. When a transformer fails, the entire control circuit goes dead: the thermostat screen goes blank, the blower and burners won't start, and no 24V is present at the control board. A buzzing transformer, a tripped internal fuse, or a burnt smell are all signs the original has shorted and needs replacement. This is a genuine OEM replacement built to the exact electrical specs of the original.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1177217 |
| Type | Control Transformer |
| Brand | ICP / Tempstar / Heil |
| Rating | 40 VA |
| Primary Voltage | 120V |
| Secondary Voltage | 24V |
| Fit | OEM Direct Replacement |
Compatibility
Directly fits ICP model WFSR040A030A2 and is shared across many Tempstar, Heil, and Comfortmaker furnaces and air handlers that use a 120V-to-24V 40VA control transformer. Always confirm your old transformer's VA rating and voltage markings match before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the furnace or air handler service panel to expose the control compartment.
- Document — Photograph all primary (120V) and secondary (24V) wire connections before disconnecting.
- Remove — Disconnect the lead wires or terminals, then unbolt the transformer from its mounting bracket.
- Install — Mount the new transformer, reconnect the primary and secondary leads exactly per your photo.
- Test — Restore power and verify 24V across the secondary terminals and that the thermostat powers up.
Signs You Need a Replacement
- Thermostat screen is blank or completely dead
- No 24V reading at the control board or gas valve
- Audible buzzing or humming from the transformer
- Burnt smell or visible scorching on the transformer body
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