ICP 40VA Transformer for WJA342000K000A1 — 208/230V to 24V | Ships Today

Overview

This OEM 40VA control transformer (part number 1173691) steps 208/230 line voltage down to the 24 volts that powers the thermostat, control board, contactor coil, and gas valve on your ICP WJA342000K000A1 system. It ships with the matching 24V terminal barrier (part number 1176032) for safe, code-correct low-voltage connections. The transformer is the heart of the control circuit — if it fails, nothing on the 24V side will operate. A 40VA rating provides enough capacity for the standard control load on this platform. Transformers typically fail from a shorted thermostat wire, a stuck contactor coil drawing excess current, or an internal winding burnout, often blowing the low-voltage fuse repeatedly. Common symptoms include a completely dead thermostat, no 24V at the R terminal, a tripped or blown control fuse, or a burnt-electrical smell at the transformer. Always correct the underlying short before installing a new transformer.

Specifications

Compatibility

This 40VA transformer and 24V barrier set is the OEM control-power assembly for the ICP WJA342000K000A1 and the same-platform Tempstar, Heil, and Comfortmaker units. Confirm part numbers 1173691 and 1176032 and the 208/230V primary tap before installing.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter on the primary leads.
2. Access — Remove the control-compartment service panel to reach the transformer.
3. Document — Photograph the primary (line) and secondary (24V) wiring before disconnecting.
4. Remove — Disconnect the primary and secondary leads, then unscrew the failed transformer and barrier from the panel.
5. Install — Mount the new transformer and barrier, land the 208/230V leads on the primary and the 24V leads on the secondary per your photo.
6. Test — Restore power and confirm 24 VAC across the secondary and a live thermostat before closing up.

Signs You Need a Replacement

• Completely dead thermostat with no 24V at the R terminal.
• Control fuse blows immediately or repeatedly.
• No response from the contactor or control board on a call.
• Burnt smell or discoloration at the transformer body.

Shipping & Returns

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