What are the specs for this Transformer?

The correct replacement for Tempstar model TCK125N20A1 — 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 TCK125N20A1 — 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 TCK125N20A1 — 40VA 115V to 24V | Ships Today

Name: Tempstar Transformer for TCK125N20A1 — 40VA 115V to 24V | Ships Today
Brand: Tempstar
SKU: 1011626-GEN
Price: 29.00 USD
Availability: InStock

SKU: 1011626-GEN Brand: Tempstar

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Overview

This OEM control transformer (part #1011626) steps down 115V line voltage to the 24V control voltage used by your Tempstar TCK125N20A1 furnace. Rated at 40VA, it powers the thermostat, gas valve, control board, and relays that run the heating cycle. When a transformer fails, the entire low-voltage control circuit goes dead: the thermostat screen blanks, the blower and igniter never energize, and the unit will not respond to a call for heat. A buzzing transformer, a blown 3-amp control fuse that keeps failing, or a melted/discolored housing are all signs the transformer has shorted or is overloaded.

Specifications

Spec	Value
Part Number	1011626
Type	Control Transformer
Brand	Tempstar
Rating	40 VA
Primary Voltage	115V
Secondary Voltage	24V

Compatibility

Designed as a direct-fit replacement for the Tempstar TCK125N20A1 gas furnace. The 40VA 115-to-24V transformer is also common across ICP-family equipment (Heil, Comfortmaker, Tempstar) using the same control platform. Always confirm your existing transformer's VA rating and voltage tap before installing.

Installation Guide

Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
Access — Remove the furnace control/blower service panel.
Document — Photograph all primary and secondary wire connections before disconnecting.
Remove — Disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the transformer from the burner-box bracket.
Install — Mount the new transformer, reconnect primary and secondary leads per your photo, matching the correct voltage tap.
Test — Restore power and confirm 24V across the secondary and a normal heating cycle.

Signs You Need a Replacement

Thermostat display is blank and the furnace is completely unresponsive.
Control fuse blows repeatedly after replacement.
Audible buzzing or humming from the transformer.
No 24V reading across the secondary terminals with line power 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 Transformer for TCK125N...

$29.00

Frequently Asked Questions

Does this Transformer fit my Tempstar TCK125N20A1 — 40VA 115V to 24V | Ships Today?

Yes. This is the factory-specified OEM transformer for the Tempstar TCK125N20A1 — 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 TCK125N20A1 — 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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