ICP 40VA Transformer for WAHT604A1 — 208/230V to 24V | Ships Today
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
Overview
This genuine OEM control transformer (part number 1172028) for the ICP / Tempstar / Heil WAHT604A1 air handler converts 208/230 volts of line power into a 24-volt, 40VA control output. That low-voltage supply powers the thermostat, fan coil control board, relays, and safety switches. The 40VA rating delivers enough capacity to drive the control board, blower relay, and thermostat together. A failed transformer — from an internal short, overload, or simple age — kills the entire low-voltage control circuit, leaving the thermostat dark and the blower unable to start on a heat or cool call. Watch for a dead thermostat, a buzzing transformer, fuses that blow as soon as they're replaced, and a burnt odor inside the control box.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1172028 |
| Type | Control Transformer |
| Brand | ICP (Tempstar / Heil) |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Rating | 40VA |
| Fits Model | WAHT604A1 |
| Fitment | OEM Replacement |
Compatibility
A direct OEM replacement for the ICP / Tempstar / Heil WAHT604A1 air handler and related ICP units using the 208/230V-to-24V 40VA control platform. This is the same transformer (1172028) used across several WAHT-series fan coils — verify the part number on your existing unit for an exact match.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
- Access — Remove the air handler service panel to reach the control box.
- Document — Photograph all primary and secondary wiring before disconnecting.
- Remove — Verify the 208/230V primary tap, label the leads, disconnect, and unbolt the old transformer.
- Install — Mount the new 40VA transformer, matching the primary lead to your incoming line voltage, and reconnect per your photo.
- Test — Restore power and confirm 24V across the secondary and normal blower/thermostat operation.
Signs You Need a Replacement
- Thermostat is blank or unresponsive
- Low-voltage fuse blows repeatedly
- Loud humming or buzzing from the transformer
- Burnt smell or scorch marks on the transformer housing
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