ICP 40VA Transformer for WFMR045A036B1 — 120V to 24V Furnace Control | Ships Today
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Overview
This genuine ICP 40VA control transformer (OEM part number 1177217) steps line voltage down from 120V to 24V to power the low-voltage control circuit of the WFMR045A036B1 gas furnace. The 24V output drives the thermostat, gas valve, control board relays, and safety switches. When a transformer fails — typically from a shorted control wire, a stuck gas valve drawing excess current, or simple age — the entire furnace goes dead: no thermostat response, no blower, no ignition. A blown transformer is one of the most common no-heat causes and is inexpensive to replace. Look for a furnace that is completely unresponsive at the thermostat while line voltage is confirmed present at the unit, or a transformer that is hot, swollen, or smells burnt.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1177217 |
| Type | Step-Down Control Transformer |
| Brand | ICP (Tempstar / Heil) |
| Rating | 40 VA |
| Primary Voltage | 120V |
| Secondary Voltage | 24V |
| Fit | OEM direct replacement |
Compatibility
Fits the ICP / Tempstar / Heil WFMR045A036B1 gas furnace and other ICP-family units calling for a 40VA 120-24V control transformer. Verify your existing transformer is rated 120V primary / 24V secondary before ordering.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage at the transformer primary leads with a multimeter.
- Access — Remove the furnace control-area service panel.
- Document — Photograph all primary (120V) and secondary (24V) wire connections before disconnecting.
- Remove — Disconnect the leads, remove the transformer mounting screws, and lift out the old unit.
- Install — Mount the new transformer, reconnect primary and secondary leads exactly per your photo.
- Test — Restore power, confirm 24V at the secondary with a meter, and verify the furnace responds to a thermostat call.
Signs You Need a Replacement
- Furnace completely unresponsive while 120V line power is present
- No 24V reading at the control board or thermostat terminals
- Transformer is hot, swollen, or has a burnt odor
- Repeated control-fuse blowing after the transformer fails
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