Tempstar 40VA Transformer for TNK075F14A1 — 115V to 24V (OEM 1011626) | Ships Today

Overview

This OEM control transformer (Tempstar part number 1011626, "TRANS 115>24 40VA") supplies the 24-volt control power for the Tempstar TNK075F14A1 furnace. It steps 115V line voltage down to 24V at 40VA to run the control board, gas valve, thermostat circuit, and inducer relay. When the transformer fails — usually from a shorted control wire, a failed gas valve, or age — the furnace goes completely dead: no thermostat display, no board lights, no response to a heat call. A blown transformer is often a symptom of a downstream short, so inspect the low-voltage wiring before powering up the replacement.

Specifications

Compatibility

Direct OEM fit for the Tempstar TNK075F14A1 furnace and other ICP-family units (Heil, Comfortmaker, Tempstar) calling for transformer part 1011626. Confirm the primary/secondary voltages and VA rating against your unit before installing.

Installation Guide

1. Safety First — Disconnect power at the switch and breaker. Verify zero voltage with a multimeter.
2. Access — Remove the furnace control-compartment service panel.
3. Document — Photograph the primary (line) and secondary (24V) wire connections before disconnecting.
4. Remove — Disconnect the wiring, remove the mounting screws, and take out the old transformer.
5. Install — Mount the new transformer and reconnect line and low-voltage leads exactly per your photo.
6. Test — Restore power and confirm 24V across the secondary and normal furnace startup.

Signs You Need a Replacement

• Furnace is completely unresponsive — no 24V control power, blank thermostat.
• No measurable voltage on the secondary terminals with line power present.
• Burnt smell, discolored case, or visibly melted windings.
• Repeated low-voltage fuse failures traced back to the transformer.

Shipping & Returns

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