What are the specs for this Transformer?

The correct replacement for Tempstar model T8DNL050B12A1 — 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 T8DNL050B12A1 — 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 115V to 24V 40VA for T8DNL050B12A1 — Ships Today

Name: Tempstar Transformer 115V to 24V 40VA for T8DNL050B12A1 — Ships Today
Brand: Tempstar
SKU: 1012722-GEN
Price: 29.00 USD
Availability: InStock

SKU: 1012722-GEN Brand: Tempstar

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Overview

This is a genuine OEM control transformer (part number 1012722) for the Tempstar T8DNL050B12A1 furnace. It steps line voltage down from 115 volts on the primary to 24 volts on the secondary at 40 VA, supplying the low-voltage control power that runs the thermostat circuit, gas valve, ignition control, and relays. Without a working transformer the entire 24V control side goes dead: the thermostat screen may blank, the system will not respond to a call for heat or cool, and the unit appears completely unpowered even though line voltage is present. A transformer typically fails from an internal short, an open winding caused by a shorted control component downstream, or simple age-related insulation breakdown. Replacing it with the correct 40 VA OEM unit restores reliable control power without overloading the circuit.

Specifications

Spec	Value
OEM Part Number	1012722
Type	Step-Down Control Transformer
Brand	Tempstar
Primary Voltage	115V
Secondary Voltage	24V
Rating	40 VA
Fits Model	T8DNL050B12A1

Compatibility

Designed as the factory-spec control transformer for the Tempstar T8DNL050B12A1 and shared platforms across the ICP / Heil family that use the same 115V-to-24V 40VA assembly. Always confirm the existing part number before ordering.

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 every primary and secondary wire connection before disconnecting.
Remove — Disconnect the primary (line) and secondary (24V) leads, then unbolt or unclip the old transformer from the panel.
Install — Mount the new transformer, then reconnect primary and secondary leads exactly per your photo.
Test — Restore power and confirm 24V across the secondary terminals and normal system operation.

Signs You Need a Replacement

Blank thermostat or no 24V control power
System will not respond to heat or cool calls despite line voltage present
Measured secondary voltage is zero or well below 24V
Burnt smell, scorched casing, or a repeatedly blown low-voltage fuse

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 115V to 24V...

$29.00

Frequently Asked Questions

Does this Transformer fit my Tempstar T8DNL050B12A1 — Ships Today?

Yes. This is the factory-specified OEM transformer for the Tempstar T8DNL050B12A1 — 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 T8DNL050B12A1 — 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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