What are the specs for this Transformer?

The correct replacement for Tempstar model T9MPD075F12A1 — 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 T9MPD075F12A1 — 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 40VA Transformer for T9MPD075F12A1 — 115V to 24V | Ships Today

Name: Tempstar 40VA Transformer for T9MPD075F12A1 — 115V to 24V | Ships Today
Brand: Tempstar
SKU: 1012722-GEN
Price: 28.95 USD
Availability: InStock

SKU: 1012722-GEN Brand: Tempstar

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Overview

This OEM control transformer (part #1012722) supplies the 24-volt control voltage for the Tempstar T9MPD075F12A1 modulating gas furnace. It steps 115 VAC line voltage down to 24 VAC and is rated at 40 VA, providing enough capacity to drive the control board, gas valve, thermostat circuit, and contactor or relay loads. The transformer is the heart of the low-voltage system: if it fails, the entire 24V control circuit goes dead and the furnace will not respond to a call for heat at all. A blown transformer is frequently the result of a shorted thermostat wire or a failed gas valve solenoid, so always check for downstream shorts before installing a replacement to avoid burning out the new part.

Specifications

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

Compatibility

Direct-fit replacement for the Tempstar T9MPD075F12A1 and other ICP, Heil, Comfortmaker, and Tempstar furnaces using a 115V-to-24V 40VA control transformer. Verify the primary voltage and mounting footprint match your existing unit.

Installation Guide

Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
Access — Remove the control compartment service panel.
Document — Photograph the primary and secondary wiring before disconnecting.
Remove — Disconnect the leads, remove the mounting screws, and lift out the old transformer. Check downstream wiring for shorts.
Install — Mount the new transformer, reconnect primary and secondary leads per your photo, and secure it.
Test — Restore power and confirm 24 VAC on the secondary and normal furnace operation.

Signs You Need a Replacement

No 24V control voltage and a completely unresponsive furnace
Thermostat is blank or will not power up
Burnt smell or visible scorching on the transformer
Repeated blown low-voltage fuse on the control board

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 40VA Transformer for T9...

$28.95

Frequently Asked Questions

Does this Transformer fit my Tempstar T9MPD075F12A1 — 115V to 24V | Ships Today?

Yes. This is the factory-specified OEM transformer for the Tempstar T9MPD075F12A1 — 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 T9MPD075F12A1 — 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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