Tempstar Control Transformer for T9MPD080J16A3 — 40VA 115V to 24V | Ships Today

Overview

This OEM control transformer (part #1012722) steps down 115V line voltage to the 24V control voltage that powers your Tempstar T9MPD080J16A3 furnace's circuit board, relays, gas valve, and thermostat circuit. Rated at 40VA, it supplies enough power to energize all of the unit's low-voltage controls. When a transformer fails, the furnace goes completely dead — no thermostat response, no ignition sequence — and a failing transformer will frequently blow the low-voltage fuse on the control board. It is one of the most common causes of a totally unresponsive furnace.

Specifications

Compatibility

Direct OEM fit for the Tempstar T9MPD080J16A3 gas furnace. This transformer is shared across many ICP-family furnaces (Heil, Comfortmaker, Tempstar) using the same 40VA control platform. Verify your existing part number reads 1012722 before ordering.

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 blower/control compartment service panel.
3. Document — Photograph all primary and secondary wire connections before disconnecting.
4. Remove — Disconnect the line-voltage and low-voltage leads, then unbolt the failed transformer from the mounting bracket.
5. Install — Mount the new transformer and reconnect the primary (115V) and secondary (24V) leads exactly per your photo.
6. Test — Restore power, confirm 24V across the secondary terminals, and verify the furnace responds to a thermostat call.

Signs You Need a Replacement

• Furnace completely unresponsive — no thermostat or control board activity
• Repeatedly blown low-voltage fuse on the control board
• No measurable 24V at the secondary terminals
• Visible burn marks, swelling, or a burnt smell from the transformer

Shipping & Returns

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