What are the specs for this Transformer?

The correct replacement for Tempstar model TDE125J20A1 — 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 TDE125J20A1 — 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 TDE125J20A1 — 115V to 24V | Ships Today

Name: Tempstar 40VA Transformer for TDE125J20A1 — 115V to 24V | Ships Today
Brand: Tempstar
SKU: 1011626-GEN
Price: 32.95 USD
Availability: InStock

SKU: 1011626-GEN Brand: Tempstar

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014

SAM.gov Registered

Govt POs Accepted

Overview

This OEM control transformer, part number 1011626, supplies low-voltage power to the Tempstar TDE125J20A1 furnace. It steps 115V line voltage down to 24V at 40VA, powering the control board, gas valve, thermostat circuit, and relays. When the transformer fails, the entire 24V control system goes dead — the thermostat may go blank, the furnace will not respond to a call for heat, and nothing energizes even though line voltage is present. A burned or shorted transformer often has a scorched smell or visibly darkened windings.

Specifications

Spec	Value
Part Number	1011626
Type	Step-Down Control Transformer
Brand	Tempstar
Primary Voltage	115V
Secondary Voltage	24V
Rating	40VA
Fitment	OEM Replacement

Compatibility

Built for the Tempstar TDE125J20A1 and used across many ICP / Heil / Comfortmaker / Tempstar furnaces and air handlers that call for a 115V-to-24V 40VA transformer (PN 1011626). Verify your primary voltage and VA rating before installing.

Installation Guide

Safety First — Disconnect power at the switch and breaker; verify zero voltage with a multimeter.
Access — Remove the control/electrical compartment service panel.
Document — Photograph all primary and secondary leads before disconnecting.
Remove — Label and disconnect the wires, then unbolt the old transformer from its mounting bracket.
Install — Mount the new transformer and reconnect each lead per your photo, matching primary (line) and secondary (24V) sides.
Test — Restore power and confirm 24V across the secondary and that the thermostat and control board power up.

Signs You Need a Replacement

Blank thermostat or no 24V control power
Furnace completely unresponsive to a call for heat
Burnt smell or visibly scorched windings
0V reading on the secondary with line voltage present

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 TD...

$32.95

Frequently Asked Questions

Does this Transformer fit my Tempstar TDE125J20A1 — 115V to 24V | Ships Today?

Yes. This is the factory-specified OEM transformer for the Tempstar TDE125J20A1 — 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 TDE125J20A1 — 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.

Menu