Tempstar Transformer for TDE100F16B1 — 40VA 115V to 24V | Ships Today

Overview

This OEM 40VA control transformer (part number 1011626) steps 115V line voltage down to the 24V control voltage that powers your Tempstar furnace's thermostat, gas valve, ignition control, and relays. When a transformer fails, the entire low-voltage control circuit goes dead — the thermostat screen may go blank, the furnace won't respond to a heat call, and you'll often find an open secondary winding. A buzzing, overheated, or scorched transformer is a clear sign of failure. This is a direct-fit replacement rated at 40VA with a 115V primary and 24V secondary.

Specifications

Compatibility

Engineered for the Tempstar TDE100F16B1 gas furnace and shared across many ICP / Tempstar / Heil / Comfortmaker platforms that use a 115V-to-24V 40VA control transformer. Always confirm the printed primary/secondary voltages match 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/blower service panel.
3. Document — Photograph all primary and secondary wire connections before disconnecting.
4. Remove — Disconnect the line-voltage primary leads and 24V secondary leads, then unbolt the old transformer from the bracket.
5. Install — Mount the new transformer, reconnect primary to 115V and secondary to the 24V control terminals per your photo.
6. Test — Restore power and confirm 24V across the secondary and a normal heat call.

Signs You Need a Replacement

• Blank thermostat or no 24V control power
• Furnace ignores a heat call entirely
• Buzzing, humming, or overheated transformer
• Scorched casing or burnt-electrical smell near the control box

Shipping & Returns

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