ICP Transformer for WAXM604A1 — 40VA 208/230V to 24V | Ships Today

Overview

This OEM control transformer (part number 1172028) is the 24V power source for the ICP WAXM604A1 air handler. It steps down the incoming 208/230V line voltage to the 24V low-voltage power required by the thermostat, control board, contactor coils, and safety circuits. Rated at 40VA, it supplies enough current to drive the typical low-voltage load of the unit. When a transformer fails, the entire low-voltage control system goes dead: the thermostat screen blanks, the blower and compressor will not energize, and no 24V is present across the R and C terminals. Failures are usually caused by a shorted control wire, a seized contactor coil, or age-related insulation breakdown that opens the internal thermal fuse.

Specifications

Compatibility

Direct OEM fit for the ICP WAXM604A1 and compatible Tempstar and Heil air handlers using the 1172028 transformer. Always confirm the primary voltage matches your unit's incoming supply (208/230V) before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter at the unit's line terminals.
2. Access — Remove the service panel to expose the control board and transformer.
3. Document — Photograph all primary and secondary wire connections before disconnecting anything.
4. Remove — Disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the transformer from its bracket.
5. Install — Mount the new transformer, reconnect primary to the matching 208/230V tap and secondary to the 24V circuit per your photos.
6. Test — Restore power and confirm 24V across the R and C terminals; verify the thermostat powers up and the unit responds to a call for heat or cool.

Signs You Need a Replacement

• No 24V output at the secondary terminals while line voltage is present.
• Dead thermostat and no response from blower or compressor.
• Burnt smell or visibly scorched transformer housing.
• Repeated control-fuse blowouts traced back to the transformer.

Shipping & Returns

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