ICP 40VA Transformer for VNK100J16A1 — 115V to 24V | Ships Today

Overview

This OEM transformer (part #1011626) is the 115V-to-24V control transformer for ICP, Tempstar, and Heil gas furnaces. It steps down 115V line voltage to the 24V low-voltage control circuit that powers your thermostat, gas valve, igniter relay, and control board. Rated at 40VA, it supplies the steady control current the furnace needs to cycle safely. When a transformer fails — usually from a shorted secondary, an overloaded control circuit, or age-related winding breakdown — the furnace goes completely dead: no thermostat display, no blower, no ignition. A blown transformer is one of the most common no-heat call causes and often takes out a board fuse with it.

Specifications

Compatibility

Direct-fit replacement for ICP Tempstar Heil model VNK100J16A1 and shares the same 1011626 transformer used across many ICP-family gas furnaces and air handlers built on the same control platform. Always confirm the part number on your existing transformer before ordering.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the furnace control/service panel.
3. Document — Photograph all primary and secondary wire connections before disconnecting.
4. Remove — Disconnect the primary (line) and secondary (24V) leads, then unscrew the transformer from its mounting bracket.
5. Install — Mount the new transformer, reconnect primary and secondary leads per your photo.
6. Test — Restore power and confirm 24V across the secondary and a normal heat cycle.

Signs You Need a Replacement

• Furnace completely dead — no thermostat display or response
• No 24V reading across the secondary terminals
• Repeated blown low-voltage fuse on the control board
• Burnt smell or visibly scorched transformer windings

Shipping & Returns

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