ICP 40VA Transformer for WAXL604A3 – 208/230V to 24V | Ships Today

Overview

This genuine OEM control transformer (part number 1172028) steps 208/230V line voltage down to 24V at 40VA for the ICP/Tempstar/Heil WAXL604A3. The 24V output feeds the thermostat, control board, relays, contactor coil, and gas valve that make up the low-voltage control circuit. When the transformer fails the entire system typically goes dead — no thermostat display, no blower, and no response on a call for heating or cooling. Common causes are a shorted secondary circuit, normal age fatigue, or a power surge, and a control fuse that keeps blowing is a classic symptom of a failing transformer.

Specifications

Compatibility

Direct OEM replacement control transformer for the ICP/Tempstar/Heil WAXL604A3. The same 1172028 transformer is used across many ICP-family WAXL and WAXM air handlers; verify the 208/230V primary and 40VA rating against your existing unit before installing.

Installation Guide

1. Safety First – Disconnect power at the breaker and verify zero voltage with a multimeter at both the line and 24V terminals.
2. Access – Remove the control panel service cover.
3. Document – Photograph the primary and secondary wire connections before disconnecting any leads.
4. Remove – Disconnect the primary and secondary wires, then unbolt or unclip the failed transformer from the panel.
5. Install – Mount the new transformer, reconnect the 208/230V primary and 24V secondary leads per your photo, and confirm tight terminals.
6. Test – Restore power and verify 24V across the secondary and a normal thermostat response.

Signs You Need a Replacement

• System completely dead with a blank thermostat
• No 24V present at the secondary terminals
• Low-voltage fuse or breaker blows repeatedly
• Burnt smell or visibly charred transformer windings

Shipping & Returns

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