Tempstar Transformer for TNE050B12A1 — 40VA 115V to 24V | Ships Today

Overview

This OEM Tempstar control transformer (part number 1011626) converts 115V line voltage to 24V to drive the low-voltage control circuit of your TNE050B12A1 furnace. Rated at 40VA, it powers the thermostat, gas valve, ignition control, relays, and contactor coils. When the transformer fails, the entire 24V side loses power — the thermostat goes dark, the igniter and blower won't energize, and the furnace ignores any call for heat. Persistent buzzing, a low-voltage fuse that blows repeatedly, or a scorched control board are all telltale signs that the transformer needs to be replaced.

Specifications

Compatibility

Direct-fit replacement for the Tempstar TNE050B12A1 furnace. This 115V-to-24V 40VA transformer is shared across many ICP, Heil, and Comfortmaker furnace platforms. Confirm your existing transformer's VA rating and voltages 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/blower compartment service panel.
3. Document — Photograph all primary (line) and secondary (24V) wire connections before disconnecting.
4. Remove — Disconnect the transformer leads and unbolt it from the control panel or bracket.
5. Install — Mount the new transformer and reconnect primary and secondary leads exactly per your photo.
6. Test — Restore power, confirm 24V across the secondary terminals, then verify a full heat cycle.

Signs You Need a Replacement

• Blank or unresponsive thermostat with no 24V control power
• Low-voltage control fuse blows repeatedly
• Buzzing or humming from the transformer
• Burnt smell or visible scorching on the transformer body

Shipping & Returns

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