Tempstar 40VA Transformer for TNE100F14A1 — 115V to 24V Control | Ships Today

Overview

This genuine OEM control transformer (part number 1011626) supplies 24V control power for the Tempstar TNE100F14A1 gas furnace. It steps the 115V line voltage down to a 24V secondary at 40VA, energizing the control board, thermostat circuit, gas valve, and ignition sequence. When a transformer fails — usually from a shorted low-voltage wire, a stuck contactor, or simple age — the furnace goes completely dead at the thermostat: no display, no blower, no ignition. The 40VA rating provides ample headroom for the furnace's 24V loads and is a direct match for the factory unit.

Specifications

Compatibility

Fits the Tempstar TNE100F14A1 and other ICP-family furnaces (Tempstar, Heil, Comfortmaker, Arcoair) that use a 115V-to-24V, 40VA control transformer. Confirm your existing transformer is 115/24V 40VA before ordering.

Installation Guide

1. Safety First — Disconnect power at the switch and breaker, then verify zero voltage with a multimeter at the transformer leads.
2. Access — Remove the control/blower compartment service panel.
3. Document — Photo the primary and secondary wire connections before disconnecting.
4. Remove — Disconnect the 115V primary and 24V secondary leads, remove the mounting screws, and lift out the old transformer.
5. Install — Mount the new transformer, then reconnect primary to line and secondary to the control circuit exactly per your photo.
6. Test — Restore power and confirm 24V at the secondary, a live thermostat, and a normal heat cycle.

Signs You Need a Replacement

• Furnace and thermostat are completely dead with line voltage present
• No 24V reading across the secondary terminals
• Transformer is hot, buzzing, or smells burnt
• Blown low-voltage fuse that recurs after reset

Shipping & Returns

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