ICP 40VA Transformer for WPG4304040RKA1 — 208/230V to 24V OEM 1173691 | Ships Today

Overview

This OEM 40VA control transformer steps line voltage down to the 24V low-voltage power that runs the thermostat, control board, gas valve, and relays on the ICP / Tempstar / Heil WPG4304040RKA1 packaged gas unit. It accepts a 208/230V primary and delivers a regulated 24V secondary at 40VA. A failed transformer means a completely dead control circuit — no thermostat display, no call for heat or cool, and an unresponsive system. Shorted thermostat wiring or a faulty gas valve will often blow the transformer, so inspect for shorts before replacing. This listing covers OEM part numbers 1173691 (transformer 208/230 to 24V, 40VA) and 1178431 (24V barrier/terminal), the factory-correct components for this model.

Specifications

Compatibility

Direct-fit replacement for the ICP / Tempstar / Heil WPG4304040RKA1 packaged gas furnace. Verify primary voltage, 24V secondary, and 40VA rating match your original before ordering.

Installation Guide

1. Safety First — Disconnect power at the unit disconnect and verify zero voltage with a multimeter.
2. Access — Remove the control/electrical service panel.
3. Document — Photograph all primary and secondary lead connections before disconnecting.
4. Remove — Label and disconnect the leads, then unbolt the old transformer from the bracket.
5. Install — Mount the new transformer, land the primary leads on the matching line voltage taps, and reconnect the 24V secondary per your photo.
6. Test — Restore power and confirm 24V across the secondary and a responsive thermostat.

Signs You Need a Replacement

• Blank thermostat and completely dead control circuit
• No 24V output measured across the secondary
• Burnt smell or visible scorching on the transformer
• Repeated failures after a shorted low-voltage wire or gas valve

Shipping & Returns

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