ICP Transformer for WAHM302A1 — 40VA 208/230V to 24V | Ships Today

Overview

This OEM transformer (part number 1172028) supplies the 24-volt control power for your ICP WAHM302A1 air handler. It is a 40VA step-down transformer with a dual-tap 208/230V primary winding and a 24V secondary that feeds the thermostat, fan coil control board, and low-voltage relays. A failed transformer kills the entire control circuit — the thermostat goes dark, the blower and relays will not energize, and the unit appears completely dead despite having line voltage. Buzzing, a burnt-electrical odor, or a repeatedly blown low-voltage fuse all point to a shorted or burned-out transformer.

Specifications

Compatibility

Direct OEM replacement for the ICP WAHM302A1 air handler. Because ICP builds the Tempstar, Heil, Comfortmaker, and Arcoaire lines, this 40VA transformer also fits comparable WAHM-series fan coils that use the same 208/230V-to-24V control supply. Verify part number 1172028 against your existing transformer before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring.
2. Access — Remove the air handler service panel to expose the control board and transformer.
3. Document — Photograph all primary and secondary wire connections before disconnecting.
4. Remove — Disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the transformer from its bracket.
5. Install — Mount the new transformer, wire the correct primary tap for your supply voltage (208V or 230V), and reconnect the 24V secondary per your photos.
6. Test — Restore power and confirm 24VAC across the secondary terminals and normal control operation.

Signs You Need a Replacement

• Thermostat is blank or dead while line voltage is confirmed present.
• Blower, relays, or board will not energize on a call for heat or cool.
• Audible buzzing from the transformer or a burnt-electrical smell.
• Repeatedly blown low-voltage fuse or no measurable 24VAC at the secondary.

Shipping & Returns

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