ICP Transformer for WAHT304A2 — 40VA 208/230V to 24V | Ships Today

Overview

This is a genuine OEM 40VA control transformer (part #1172028) for the ICP WAHT304A2 air handler. The transformer steps the line-voltage 208/230V primary down to a 24V secondary, supplying low-voltage power to the thermostat, control board, relays, and contactor coils. When a transformer fails, the entire low-voltage control circuit goes dead: the thermostat screen blanks, the system won't respond to a heat or cool call, and you may smell a burnt odor or find a blown low-voltage fuse on the control board. A weak or shorted transformer can also cause intermittent operation as it overheats and drops out. Rated at 40VA, it has the capacity to drive the air handler's full complement of controls without nuisance dropouts.

Specifications

Compatibility

Engineered as a direct-fit replacement for the ICP WAHT304A2 air handler and shared across many ICP-family units sold under the Tempstar, Heil, Comfortmaker, and Arcoaire labels that use the 1172028 transformer. Always confirm your existing transformer is rated 40VA with a 208/230V primary and 24V secondary before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage at the unit with a multimeter before touching any wiring.
2. Access — Remove the air handler control/blower access panel.
3. Document — Photograph the primary and secondary wire connections before disconnecting anything.
4. Remove — Disconnect the primary (line) and secondary (24V) leads, then unbolt the failed transformer from its bracket.
5. Install — Mount the new transformer, matching the 208/230V primary tap and reconnecting the 24V secondary leads exactly per your photo.
6. Test — Restore power and confirm 24V across the secondary and normal system response to a thermostat call.

Signs You Need a Replacement

• Thermostat is blank or unpowered with line voltage present at the unit
• System does not respond to heat or cool calls
• Repeatedly blown 24V low-voltage fuse on the control board
• Burnt smell or visible scorching at the transformer housing

Shipping & Returns

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