ICP 24V Transformer for WAXA18004A1 — 40VA Class 2 Control | Ships Today
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Overview
This OEM 24V control transformer (part #202300900212) supplies low-voltage power to the control circuit of your ICP/Heil/Tempstar WAXA18004A1 system. It steps line voltage down to a 24V secondary so the thermostat, contactor coil, relays, and control board receive stable power. Rated at 40VA, it delivers the steady control current these components demand. When a transformer fails, the entire control circuit goes dead — no thermostat display, the contactor won't pull in, and the system will not start even though high-voltage power is present. A buzzing transformer, a blown low-voltage fuse, or zero reading across the secondary terminals are all classic signs of failure.
Specifications
| Spec | Value |
|---|---|
| Part Number | 202300900212 |
| Type | Control Transformer |
| Brand | ICP (Heil / Tempstar) |
| Secondary Voltage | 24V |
| Rating | 40VA Class 2 |
| Fit | OEM Replacement |
Compatibility
Engineered as a direct OEM fit for the ICP/Heil/Tempstar WAXA18004A1. It also serves as the standard 24V control transformer across many ICP-family heat pump and air handler platforms that share this low-voltage architecture. Always confirm your existing transformer's voltage and VA rating before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the service panel to reach the control box.
- Document — Photograph all primary and secondary wire connections before disconnecting anything.
- Remove — Label and disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the failed transformer from its mounting bracket.
- Install — Mount the new transformer, reconnect the primary to matching line voltage and the secondary 24V leads exactly per your photo.
- Test — Restore power and confirm 24V across the secondary terminals and normal thermostat/contactor operation.
Signs You Need a Replacement
- No 24V at the thermostat or control board despite line power present
- Repeatedly blown low-voltage fuse
- Audible buzzing or humming from the transformer
- Contactor or relays will not energize
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