ICP Transformer for WAHM364A1 — 208/230V to 24V 40VA | Ships Today

Overview

This OEM control transformer (part number 1172028) steps down line voltage to the 24V control circuit that powers your ICP WAHM364A1 air handler's thermostat, relays, and control board. Rated at 40VA with a 208/230V primary and a 24V secondary, it is the heart of the low-voltage system. When a transformer fails, the entire control side goes dead: the blower won't start, the thermostat screen may go blank, and the system stops responding to calls for heating or cooling. A burned-out transformer is one of the most common causes of a completely unresponsive air handler.

Specifications

Compatibility

Engineered as a direct OEM replacement for the ICP WAHM364A1 air handler and shared across many Tempstar, Heil, and Comfortmaker fan-coil units that use a 40VA 208/230-to-24V control transformer. Always confirm your existing transformer's VA and voltage ratings 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's service panel to expose the control box.
3. Document — Photograph all primary and secondary lead connections before disconnecting anything.
4. Remove — Disconnect the line-voltage primary and 24V secondary leads, then unbolt the failed transformer from its bracket.
5. Install — Mount the new transformer, matching the correct primary tap (208V or 230V) to your supply voltage, and reconnect the secondary per your photo.
6. Test — Restore power and confirm 24V across the secondary terminals and normal blower/control operation.

Signs You Need a Replacement

• No 24V output at the secondary while line voltage is present at the primary.
• System completely unresponsive — blank thermostat, no blower, no relay clicks.
• Visible scorching, melted housing, or a burnt smell at the transformer.
• Repeated blown control fuses caused by a shorted or overloaded transformer.

Shipping & Returns

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