ICP 40VA Transformer for WAXM424A1 — 208/230V to 24V | Ships Today

Overview

This is a genuine OEM 40VA control transformer (part number 1172028) for the ICP WAXM424A1 system. The transformer steps down the incoming 208/230V line voltage to the 24V control voltage that powers your thermostat, contactor coil, control board, and other low-voltage components. Rated at 40VA, it supplies the continuous current those controls require to operate reliably. When a control transformer fails, the entire 24V control circuit goes dead — the thermostat screen may go blank, the contactor will not pull in, and the system will not start a heating or cooling cycle. A buzzing, overheated, or visibly burned transformer is a clear sign of failure.

Specifications

Compatibility

Designed as a direct OEM replacement for the ICP / Tempstar / Heil WAXM424A1. ICP-built equipment shares components across the Tempstar, Heil, and Comfortmaker family, so this transformer fits many sibling models that use the 1172028 part. Always confirm the part number on your existing transformer before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage at the unit with a multimeter.
2. Access — Remove the service panel to reach the control area.
3. Document — Photograph all primary and secondary wire connections before disconnecting.
4. Remove — Label and disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the failed transformer from its bracket.
5. Install — Mount the new transformer, then reconnect the primary and secondary wires exactly per your photo.
6. Test — Restore power and verify 24V on the secondary, then confirm the system starts and runs.

Signs You Need a Replacement

• No 24V at the control board, thermostat, or contactor coil.
• Thermostat is blank or unresponsive with line power present.
• Transformer is buzzing, hot to the touch, or smells burned.
• Repeated blown low-voltage fuses or a shorted secondary winding.

Shipping & Returns

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