ICP 40VA Transformer for WAHT484B1 — 208/230V to 24V | Ships Today
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Overview
This genuine OEM control transformer (part number 1172028) for the ICP / Tempstar / Heil WAHT484B1 air handler steps 208/230 volts of line power down to a 24-volt, 40VA control output. That low-voltage power runs the thermostat, fan coil control board, relays, and safety circuits. The 40VA capacity is sized to handle the control board, blower relay, and thermostat load simultaneously. When this transformer fails — typically from an internal short, a control-circuit overload, or age — the low-voltage system goes completely dead: the thermostat blanks out and the blower won't energize on any heating or cooling call. Common warning signs include a dead thermostat, an audible buzz from the transformer, fuses that blow immediately after replacement, and a burnt smell near 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 | WAHT484B1 |
| Fitment | OEM Replacement |
Compatibility
A direct OEM replacement for the ICP / Tempstar / Heil WAHT484B1 air handler and related ICP units on the 208/230V-to-24V 40VA control platform. Part 1172028 is shared across several WAHT-series fan coils — confirm the number stamped on your existing transformer for an exact fit.
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