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Lennox

OEM Lennox Transformer — 12P61

SKU: LNX-12P61 Brand: Lennox
$29.95 $39.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 12P61 transformer steps down incoming line voltage to the low-voltage 24V control power that operates your thermostat, contactor, relays, and safety circuits. Nearly every control function in your Lennox furnace, air handler, or condensing unit depends on clean, stable output from this transformer — making it a small but mission-critical component.

Common failure symptoms include a completely unresponsive system, a blank thermostat, a furnace or air conditioner that won't start, a tripped or repeatedly blown low-voltage fuse, a buzzing transformer, or a burnt smell around the control board. A shorted transformer will leave the entire control circuit dead until it is replaced.

Why OEM matters: The Lennox 12P61 is rated to the exact primary and secondary voltage and VA capacity your equipment's control circuit requires. Installing the genuine OEM transformer ensures correct output, proper mounting, and reliable, code-compliant operation without overloading the control board. Substitute transformers risk incorrect VA ratings and wiring mismatches. Choose the authentic Lennox 12P61 for a safe, dependable repair.

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

Frequently Asked Questions

Does this Transformer fit my Lennox OEM Lennox Transformer — 12P61?
Yes. This is the factory-specified OEM transformer for the Lennox OEM Lennox Transformer — 12P61. 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 Lennox OEM Lennox Transformer — 12P61?
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 Lennox 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 Lennox 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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Mike Rivera
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