What are the specs for this Transformer?

The correct replacement for Tempstar model T9MPD075F12A4 — 40VA 115V to 24V | Ships Today is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Tempstar equipment which lists the model number T9MPD075F12A4 — 40VA 115V to 24V | Ships Today.

Is this transformer compatible with Bryant or Payne systems too?

Many Tempstar parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Tempstar

Tempstar Transformer for T9MPD075F12A4 — 40VA 115V to 24V | Ships Today

Name: Tempstar Transformer for T9MPD075F12A4 — 40VA 115V to 24V | Ships Today
Brand: Tempstar
SKU: 1012722-GEN
Price: 26.95 USD
Availability: InStock

SKU: 1012722-GEN Brand: Tempstar

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Overview

This OEM control transformer (part number 1012722) supplies the 24-volt power for your Tempstar T9MPD075F12A4 gas furnace. It steps line voltage down from 115V to 24V at a 40VA rating, powering the thermostat, control board, gas valve, and ignition circuit. When the transformer fails, the entire low-voltage control side goes dead: no thermostat display, no blower, no ignition sequence, and frequently a blown control-board fuse. Buzzing, overheating, a burnt smell, or a 0V secondary reading with line voltage present on the primary all point to a failed transformer that must be replaced before the furnace will run.

Specifications

Spec	Value
Part Number	1012722
Type	Control Transformer
Brand	Tempstar (ICP / Heil)
Primary Voltage	115V
Secondary Voltage	24V
Rating	40VA
Fit	OEM Direct Replacement

Compatibility

Direct-fit replacement for the Tempstar T9MPD075F12A4 modulating gas furnace and the broader T9MPD / 9MPD family built on the same ICP platform. The 115V-to-24V, 40VA configuration is shared across many Tempstar, Heil, Comfortmaker, and ICP furnaces — confirm your existing transformer's voltage and VA rating before ordering.

Installation Guide

Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter before touching any wiring.
Access — Remove the furnace blower-compartment service panel to reach the control area.
Document — Photograph all primary and secondary wire connections before disconnecting.
Remove — Disconnect the primary (115V) and secondary (24V) leads, then unbolt the transformer from its bracket.
Install — Mount the new transformer, reconnect primary and secondary leads exactly per your photo, and confirm the connections are secure.
Test — Restore power and confirm 24V across the secondary terminals and a normal call-for-heat sequence.

Signs You Need a Replacement

Furnace is completely unresponsive — no thermostat power and no ignition attempt
Repeatedly blown low-voltage fuse on the control board
0V reading on the secondary with 115V present on the primary
Buzzing, overheating, or a burnt-electrical smell from the transformer

Shipping & Returns

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

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $75
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

Tempstar Transformer for T9MPD07...

$26.95

Frequently Asked Questions

Does this Transformer fit my Tempstar T9MPD075F12A4 — 40VA 115V to 24V | Ships Today?

Yes. This is the factory-specified OEM transformer for the Tempstar T9MPD075F12A4 — 40VA 115V to 24V | Ships Today. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the transformer on my Tempstar T9MPD075F12A4 — 40VA 115V to 24V | Ships Today?

Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Photo wiring connections. Step 3: Disconnect wires from old transformer. Step 4: Remove mounting hardware. Step 5: Install new transformer, reconnect wires matching voltage ratings. Step 6: Verify 24V output with multimeter.

My thermostat has no power. What failed?

Thermostat with no display = failed 24V transformer (or blown control board fuse). Check the 3A/5A fuse on the control board first ($1–$5 fix). If fuse is good but no 24V output from transformer, replace transformer.

Is this transformer compatible with Bryant or Payne too?

Many Tempstar parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Tempstar transformer?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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