ICP Transformer for WAHT184B1 — 40VA 208/230V to 24V | Ships Today

Overview

This OEM 40VA control transformer (part number 1172028) supplies the low-voltage control power for your ICP/Tempstar/Heil WAHT184B1 air handler. It steps the 208/230V line voltage down to the 24V control voltage that runs the thermostat, control board, relays, and contactor coil. A failed transformer kills the entire 24V circuit, leaving the system completely unresponsive to the thermostat — no blower, no cooling or heating call, and often a dead thermostat display. Shorted control wiring, a stuck contactor pulling excess current, or simple age are the usual causes. A repeatedly blown low-voltage fuse, an audible buzz, or 0 volts at the secondary terminals all point to a transformer that needs replacing.

Specifications

Compatibility

Direct OEM fit for the ICP WAHT184B1 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.