ICP Transformer for WAHM604A2 — 40VA 208/230V to 24V | Ships Today

Overview

This OEM ICP control transformer (part #1172028) steps 208/230V line voltage down to 24V control voltage for the ICP/Tempstar/Heil WAHM604A2 air handler. Rated at 40VA, it supplies power to the thermostat, control board, and low-voltage switching circuits. A failed transformer leaves the system completely unpowered on a call — no blower, no heat, and a dead thermostat — and is one of the most common causes of a no-response air handler.

Specifications

Compatibility

Direct OEM fit for the ICP/Tempstar/Heil WAHM604A2 air handler. Confirm the part number 1172028 and the 208/230V-to-24V 40VA rating match your existing transformer before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
2. Access — Remove the air handler service panel.
3. Document — Photograph the primary and secondary lead connections before disconnecting.
4. Remove — Disconnect the leads and unbolt the transformer from its bracket.
5. Install — Mount the new transformer and reconnect primary and secondary leads per your photo.
6. Test — Restore power and confirm 24V at the secondary and normal system response.

Signs You Need a Replacement

• No 24V control power — system fully dead on a call
• Blank or unpowered thermostat
• Burnt smell or visible scorching on the transformer
• Repeatedly blown low-voltage fuse

Shipping & Returns

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