ICP 40VA Transformer for X8MPN150J20A1 — 115V to 24V | Ships Today

Overview

This is the genuine OEM control transformer (part number 1012722) for the ICP Tempstar Heil X8MPN150J20A1 gas furnace. The transformer steps the incoming 115V line voltage down to the 24V control voltage that powers the thermostat, gas valve, igniter circuit, and control board. Without a healthy transformer, the entire low-voltage control system goes dead — no thermostat call, no ignition sequence, no blower. Rated at 40VA, this unit supplies enough power for the furnace's control loads plus a typical thermostat and accessories. A failed transformer is a common cause of a furnace that appears completely dead despite having line power.

Specifications

Compatibility

Built for the ICP Tempstar Heil X8MPN150J20A1 and other N-series furnaces using the same 40VA 115/24V control transformer. Verify primary voltage, secondary voltage, and VA rating against your existing unit before installing.

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-compartment service panel.
3. Document — Photograph the primary and secondary wiring before disconnecting.
4. Remove — Disconnect the line and low-voltage leads, then unbolt the old transformer from its bracket.
5. Install — Mount the new transformer, reconnect 115V to the primary and 24V to the secondary exactly per your photo.
6. Test — Restore power and confirm 24V at the secondary terminals and a normal thermostat call.

Signs You Need a Replacement

• Furnace is completely unresponsive to the thermostat
• No 24V reading at the control board or gas valve
• Repeatedly blown low-voltage fuse on the board
• Burnt smell or discoloration at the transformer body

Shipping & Returns

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