ICP 40VA Transformer for WPG4244040LKA1 — OEM 208/230V to 24V | Ships Today

Overview

This OEM 40VA control transformer is the direct-fit step-down power supply for the ICP / Heil / Tempstar / Comfortmaker WPG4244040LKA1 furnace. It converts the 208/230V line input to the 24V secondary that powers the control board, thermostat, gas valve, and relays. Covered OEM part numbers: 1173691 (Trans 208/230>24 40VA) and 1178431 (Barrier 24V). When a transformer fails — from a shorted secondary, an overloaded VA draw, or a power surge — the entire 24V control circuit goes dead, leaving the furnace completely unresponsive with a blank board and no thermostat call. This direct replacement restores stable 24V control power.

Specifications

Compatibility

Built for the WPG4244040LKA1 and used across matching ICP-built furnaces sold under the Heil, Tempstar, Comfortmaker, and Arcoaire names. Confirm the VA rating and primary/secondary voltages against the failed transformer before ordering.

Installation Guide

1. Safety First — Disconnect power at the switch and breaker; verify zero voltage with a multimeter.
2. Access — Remove the control compartment service panel.
3. Document — Photograph the primary and secondary leads and their terminal positions before disconnecting.
4. Remove — Disconnect the leads, remove the mounting screws, and lift out the old transformer.
5. Install — Mount the new transformer and reconnect primary and secondary leads per your photo, observing the correct voltage tap.
6. Test — Restore power, confirm 24V across the secondary with a meter, and verify the control board and thermostat respond.

Signs You Need a Replacement

• Completely dead furnace — no control board lights, no thermostat response
• No measurable 24V on the secondary terminals
• Burnt smell, melted housing, or scorched windings
• Repeated low-voltage fuse blowing on the control board

Shipping & Returns

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