ICP Transformer for WJA330000KTP0B1 — 208/230V to 24V 40VA | Ships Today

Overview

This OEM control transformer steps 208/230V line voltage down to 24V to power the low-voltage control circuit on your ICP / Tempstar / Heil furnace or air handler. Rated at 40VA, it supplies the thermostat, contactor coil, gas valve, and control board. The kit pairs OEM transformer 1173691 with 24V barrier 1176032 for safe terminal isolation. A failed transformer is one of the most common no-heat / no-cool causes — when it burns open, the entire 24V control system goes dead. Symptoms include a blank thermostat, a system that will not respond to a call for heat or cool, or a visibly scorched/smelling transformer.

Specifications

Compatibility

Engineered as a direct-fit replacement for ICP model WJA330000KTP0B1 and shared ICP, Tempstar, Heil, and Comfortmaker platforms that use a 208/230V-to-24V 40VA control transformer. 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 with a multimeter.
2. Access — Remove the service panel to reach the control area.
3. Document — Photograph all primary and secondary wires before disconnecting.
4. Remove — Disconnect the line-voltage primary and 24V secondary leads, then unbolt the old transformer from its bracket.
5. Install — Mount the new transformer, install the 24V barrier, and reconnect each lead per your photo.
6. Test — Restore power and confirm 24V output across the secondary terminals.

Signs You Need a Replacement

• Blank or unresponsive thermostat
• No 24V at the control board or contactor coil
• Burnt smell or scorched transformer housing
• System will not start on a call for heat or cool

Shipping & Returns

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