What are the specs for this Transformer?

The correct replacement for Trane model OEM Trane Transformer — TRR01979 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 Trane equipment which lists the model number OEM Trane Transformer — TRR01979.

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OEM Trane Transformer — TRR01979

Name: OEM Trane Transformer — TRR01979
Brand: Trane
SKU: TRN-TRR01979
Price: 34.95 USD
Availability: InStock

SKU: TRN-TRR01979 Brand: Trane

$34.95 $44.95

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Genuine OEM Trane TRR01979 transformer. This transformer steps incoming line voltage down to the low-voltage power your thermostat, controls, and 24V circuit require — when it fails the unit won't respond, the thermostat goes dark, and controls lose power. Installing this OEM replacement restores stable control voltage and reliable operation for your Trane system.

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

OEM Trane Transformer — TRR01979

$34.95

Frequently Asked Questions

Does this Transformer fit my Trane OEM Trane Transformer — TRR01979?

Yes. This is the factory-specified OEM transformer for the Trane OEM Trane Transformer — TRR01979. 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 Trane OEM Trane Transformer — TRR01979?

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 Trane 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 Trane 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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OEM Trane Transformer — TRR01979

Shipping Information

Return Policy

Frequently Asked Questions