ICP Transformer for WAHT184A2 — 40VA 208/230V to 24V | Ships Today

Overview

This OEM 40VA control transformer (part number 1172028) provides the low-voltage control power for your ICP/Tempstar/Heil WAHT184A2 air handler. It steps the 208/230V line voltage down to the 24V control voltage that powers the thermostat, control board, relays, and contactor coil. When the transformer fails, the entire 24V control circuit goes dead and the system stops responding to the thermostat — no blower, no heating or cooling call, and frequently a blank thermostat. Shorted control wiring, a stuck contactor drawing excess current, or age are the typical culprits. A repeatedly blown low-voltage fuse, a buzzing or hot transformer, or 0 volts at the secondary terminals all indicate it's time to replace this part.

Specifications

Compatibility

Direct OEM fit for the ICP WAHT184A2 air handler and other ICP-family equipment (Tempstar, Heil, Comfortmaker, Arcoaire) using the 1172028 40VA transformer. Confirm your existing transformer is rated 208/230V primary / 24V secondary at 40VA before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter at both line and secondary terminals.
2. Access — Remove the air handler's electrical/service panel to expose the control area.
3. Document — Photograph all primary (line) and secondary (24V) wire connections before disconnecting.
4. Remove — Disconnect the primary and secondary leads, then unbolt the failed transformer from its mounting bracket.
5. Install — Mount the new 1172028 transformer, match the primary taps to your supply voltage, and reconnect every wire exactly per your photo.
6. Test — Restore power, confirm 24V across the secondary terminals, then verify the thermostat and blower respond.

Signs You Need a Replacement

• Thermostat is blank or unresponsive (no 24V power)
• System will not start on any call for heat or cool
• Low-voltage fuse blows repeatedly or transformer buzzes/overheats
• 0 volts measured across the 24V secondary terminals

Shipping & Returns

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