ICP 40VA Transformer for WAHL364B2 — 208/230V to 24V | Ships Today

Overview

This is the OEM ICP 40VA control transformer (part number 1172028) for ICP, Heil, and Tempstar equipment. It steps the 208/230V line voltage down to the 24V control voltage that powers the thermostat, relays, contactor coil, and control board. A failed transformer is one of the most common causes of a completely dead control circuit: no 24V means the thermostat goes blank, the blower and contactor will not pull in, and the system appears off even though line power is present. Transformers fail from age, voltage spikes, or a shorted secondary load.

Specifications

Compatibility

Direct OEM fit for the ICP / Heil / Tempstar WAHL364B2 air handler. This 40VA 208/230V-to-24V transformer is used across many ICP-family air handlers and furnaces that run a 208/230V primary control circuit. Verify the VA rating and primary/secondary voltages stamped on your existing transformer before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and unit disconnect, then verify zero voltage at the transformer primary leads with a multimeter.
2. Access — Remove the control/blower compartment service panel.
3. Document — Photograph the primary and secondary wiring and the mounting position before disconnecting.
4. Remove — Disconnect the primary and secondary leads, then unbolt the transformer from its mounting bracket.
5. Install — Mount the new transformer, then reconnect the 208/230V primary and the 24V secondary exactly per your photos.
6. Test — Restore power and confirm 24V across the secondary terminals, then verify the thermostat and controls energize.

Signs You Need a Replacement

• Blank thermostat or no 24V control voltage
• Contactor and blower will not energize on a call
• Repeatedly blown low-voltage fuse on the control board
• No measurable voltage across the transformer secondary

Shipping & Returns

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