ICP Transformer for WAXL424A2 — 40VA 208/230V to 24V | Ships Today

Overview

This is an OEM 40VA control transformer (part number 1172028) for the ICP WAXL424A2 system. The transformer steps down line voltage of 208/230V to the 24V control voltage that powers your thermostat, contactor coil, relays, and control board. When a transformer fails, the entire low-voltage control circuit goes dead — the system will not start even though high-voltage power is present. Common failure causes include a shorted thermostat wire, a failed contactor coil drawing excess current, voltage spikes, or simple age-related winding breakdown. A 40VA rating provides ample capacity for standard residential control loads.

Specifications

Compatibility

Directly fits the ICP / Tempstar / Heil WAXL424A2 and shares the 1172028 transformer used across many ICP-family 208/230V condensing units and air handlers. Always confirm your existing transformer is a 208/230V-to-24V 40VA unit before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
2. Access — Remove the unit service panel to expose the control box.
3. Document — Photograph all primary and secondary wire connections before disconnecting.
4. Remove — Disconnect the line-voltage primary leads and 24V secondary leads, then unbolt the old transformer from its bracket.
5. Install — Mount the new transformer, reconnect primary to matching 208/230V taps and secondary to the 24V terminals per your photo.
6. Test — Restore power and confirm 24V at the secondary and proper thermostat operation.

Signs You Need a Replacement

• No 24V at the secondary while line voltage is present
• Thermostat is blank or system will not energize
• Repeated blown low-voltage fuse or burnt smell at the control box
• Buzzing, overheating, or visibly scorched transformer housing

Shipping & Returns

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