ICP 40VA Transformer for WAPT304A2 — 208/230V to 24V | Ships Today

Overview

This OEM 40VA control transformer (ICP part #1172028) steps the 208/230V line voltage down to the 24V control voltage used by the ICP / Tempstar / Heil WAPT304A2 system. The transformer powers the thermostat, contactor coil, control board, and other low-voltage devices. When it fails, the 24V control circuit goes dead: the thermostat screen goes blank, the system will not respond to a call for heating or cooling, and the contactor will not pull in. Transformers typically fail from a shorted low-voltage circuit, a surge, or simple age-related winding breakdown. Installing a genuine 40VA OEM replacement restores reliable 24V control power.

Specifications

Compatibility

Direct-fit OEM replacement for the ICP / Tempstar / Heil WAPT304A2. Confirm the 208/230V primary tap and 40VA rating match your existing transformer before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
2. Access — Remove the control-compartment service panel.
3. Document — Photograph the primary and secondary wiring before disconnecting.
4. Remove — Disconnect all leads and unbolt the failed transformer from the panel.
5. Install — Mount the new transformer and reconnect primary and secondary leads exactly per your photos.
6. Test — Restore power and verify 24V across the secondary terminals.

Signs You Need a Replacement

• No 24V control voltage and a blank thermostat.
• System completely unresponsive to heat or cool calls.
• Contactor or relay coil will not energize.
• Burnt smell or visible scorching on the transformer body.

Shipping & Returns

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