ICP 40VA Transformer for WAPL304A2 — 208/230V to 24V | Ships Today
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Overview
This genuine OEM 40VA control transformer (OEM part number 1172028) steps down the 208/230V line voltage in your ICP WAPL304A2 to the 24V control voltage that powers your thermostat, relays, contactor coil, and control board. Without a working transformer, none of the low-voltage controls can operate, making it one of the most common causes of a completely dead system — no thermostat display, no fan, no call for heat or cool. Symptoms include a blank thermostat, controls that won't energize, a burnt-electrical smell at the air handler, or a transformer that buzzes loudly or shows bulged/charred windings. Replacing it with the correct 40VA OEM unit restores power to the entire control circuit.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1172028 |
| Type | Control Transformer |
| Brand | ICP (Tempstar / Heil) |
| Rating | 40 VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Fitment | OEM — Direct Replacement |
Compatibility
Direct-fit replacement for the ICP WAPL304A2 air handler and equivalent Tempstar, Heil, and Comfortmaker units using the 1172028 40VA control transformer. Verify your model and OEM part number before ordering.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter on both line and control terminals.
- Access — Remove the air handler control/service panel.
- Document — Photograph the primary (line) and secondary (24V) lead connections before disconnecting.
- Remove — Disconnect the primary and secondary leads, then unbolt the failed transformer from its mounting bracket.
- Install — Mount the new transformer, reconnect the primary leads to line voltage and the secondary leads to the 24V circuit exactly per your photo.
- Test — Restore power and confirm 24V on the secondary, a live thermostat, and normal system operation.
Signs You Need a Replacement
- Blank thermostat or dead low-voltage controls
- System will not respond to any call for heat or cool
- Loud buzzing, humming, or burnt smell at the transformer
- Bulged, discolored, or charred transformer windings
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