ICP 40VA Transformer for VNE125J20G1 — 115V to 24V | Ships Today

Overview

This OEM control transformer (part 1012722, TRANS 115>24 40VA X) supplies the low-voltage power your ICP Tempstar Heil VNE125J20G1 furnace needs to operate. It steps 115V line voltage down to 24V at 40VA, powering the control board, gas valve, thermostat circuit, and contactor coil. A failed transformer leaves the furnace completely dead on a heat call — no display, no blower, no ignition — even though line power is present. Transformers commonly fail from a shorted thermostat wire, a stuck gas-valve coil, or simple age-related winding breakdown.

Specifications

Compatibility

Designed for the ICP Tempstar Heil VNE125J20G1 furnace and interchangeable across many ICP-family (Comfortmaker, Arcoaire, KeepRite) units using a 115V-to-24V 40VA control transformer. Verify the primary tap and VA rating against your existing part before installing.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker. Verify zero voltage with a multimeter.
2. Access — Remove the control/blower compartment panel to reach the transformer.
3. Document — Photograph every primary and secondary lead before disconnecting.
4. Remove — Disconnect the wires, remove the mounting screws, and lift out the old transformer.
5. Install — Mount the new transformer, then reconnect 115V primary and 24V secondary leads exactly per your photo.
6. Test — Restore power and confirm 24V at the secondary and normal furnace operation on a heat call.

Signs You Need a Replacement

• Furnace is completely unresponsive despite confirmed 115V line power
• No 24V reading at the control board or thermostat terminals
• Blown low-voltage fuse that re-blows after replacement
• Burnt smell or discolored windings at the transformer

Shipping & Returns

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