ICP Transformer for WAHT424A2 — 40VA 208/230V to 24V | Ships Today

Overview

This genuine OEM ICP control transformer (part number 1172028) steps 208/230V line voltage down to the 24V control voltage that powers your thermostat, relays, and fan-coil control board in the WAHT424A2 air handler. Rated at 40VA, it supplies the low-voltage circuit for the entire system. A failed transformer is one of the most common causes of a completely dead control system — no thermostat display, no fan, and no heating or cooling — even though line power is present. Transformers commonly fail from a shorted control wire, a stuck contactor, or a power surge.

Specifications

Compatibility

Direct OEM replacement for the ICP/Tempstar/Heil WAHT424A2 fan coil air handler. Verify the primary/secondary voltage and the 40VA rating against your existing unit before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and confirm zero voltage with a multimeter.
2. Access — Remove the air handler control-compartment service panel.
3. Document — Photograph all primary and secondary leads before disconnecting.
4. Remove — Label and disconnect the line-voltage and 24V leads, then unbolt the old transformer from the bracket.
5. Install — Mount the new transformer, reconnect the primary to the correct 208 or 230V tap and the secondary to the 24V circuit per your photos.
6. Test — Restore power and verify 24V at the secondary and normal control-system operation.

Signs You Need a Replacement

• Blank thermostat and completely dead low-voltage system.
• No 24V reading at the control board or thermostat terminals.
• Burnt smell or visibly scorched transformer windings.
• Repeated blown fuses on the control board after reset.

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.