ICP 40VA Transformer for WPG4484130LKA1 — 208/230 to 24V OEM 1173691 | Ships Today

Overview

This OEM 40VA control transformer (part 1173691, "TRANS 208/230>24 40VA") with its 24V barrier (part 1178431) steps the 208/230V line voltage down to the 24V control circuit on the ICP Tempstar Heil WPG4484130LKA1. Every low-voltage component — the thermostat, gas valve, relays, and control board logic — depends on clean 24VAC from this transformer. When it fails or shorts, the entire control circuit goes dead: no thermostat response, no ignition, and often a blown low-voltage fuse on the board. A correctly rated 40VA transformer restores stable control power without overloading.

Specifications

Compatibility

Built for the ICP / Tempstar / Heil WPG4484130LKA1 and other ICP-family units using the 1173691 transformer and 1178431 barrier. Confirm primary voltage tap and VA rating before installing.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the control-compartment service panel.
3. Document — Photograph the primary and secondary leads and the voltage tap in use.
4. Remove — Disconnect all leads, unbolt the transformer and barrier from the mounting bracket.
5. Install — Mount the new transformer, install the 24V barrier, and reconnect leads to the matching primary tap and 24V secondary.
6. Test — Restore power and confirm 24VAC at the secondary and normal thermostat operation.

Signs You Need a Replacement

• No 24V control power; thermostat and system are unresponsive.
• Repeatedly blown low-voltage control fuse.
• Transformer is buzzing, overheated, or has a burnt smell.
• Measured secondary voltage is missing or far below 24VAC.

Shipping & Returns

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