ICP Transformer for WAPM304A2 — 40VA 208/230V to 24V | Ships Today
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
Overview
This OEM control transformer is the direct factory replacement for ICP/Tempstar/Heil model WAPM304A2. It steps the incoming 208/230V line voltage down to the 24V control voltage that powers the thermostat, relays, and low-voltage circuitry. Rated at 40VA, it replaces ICP part number 1172028 (Transformer 208/230 to 24, 40VA). A failed transformer is one of the most common causes of a completely dead control system: no display on the thermostat, the blower and contactor won't energize, and the unit appears to have lost all power even though line voltage is present. Installing the correct OEM transformer restores reliable 24V control power without overloading the secondary.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1172028 |
| Type | Step-Down Control Transformer |
| Brand | ICP (Tempstar / Heil) |
| Rating | 40VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Fits Model | WAPM304A2 |
| Fitment | OEM Direct Replacement |
Compatibility
Engineered specifically for the ICP/Tempstar/Heil WAPM304A2 air handler and other WAPM-series units that use the 40VA 208/230-to-24V transformer (part 1172028). Verify your existing transformer's VA rating and primary tap match before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before handling wiring.
- Access — Remove the control-compartment service panel.
- Document — Photograph the primary (line) and secondary (24V) wire connections before disconnecting.
- Remove — Disconnect the primary and secondary leads and unbolt the old transformer from its mounting bracket.
- Install — Mount the new transformer, match the primary tap to your supply voltage (208V or 230V), and reconnect the secondary leads per your photo.
- Test — Restore power and confirm 24V across the secondary terminals, then verify the thermostat powers up and the system energizes.
Signs You Need a Replacement
- Blank thermostat with no 24V control power
- Blower and contactor will not energize despite present line voltage
- Burnt smell or visibly scorched transformer housing
- Repeatedly blown low-voltage fuse or no measurable 24V on the secondary
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