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Lennox

OEM Lennox Transformer — 13H28

SKU: LNX-13H28 Brand: Lennox
$29.95 $39.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 13H28 transformer steps down incoming line voltage to the low-voltage (typically 24V) control power that runs your thermostat, control board, relays, and safety circuits. It's the electrical heart of the control system, and virtually every Lennox furnace and air handler relies on a healthy transformer to operate.

Common failure symptoms: A failed 13H28 often shows up as a completely dead thermostat, a blank control board, a system that won't respond to any call for heat or cool, or a repeatedly blown low-voltage fuse. Transformers can burn out from a shorted control wire, overheat, or simply fail with age — sometimes with a faint burnt smell.

Why OEM matters: Matching the exact VA rating and secondary voltage is essential for stable control power. The factory Lennox 13H28 is spec'd to your equipment's load, mounts correctly, and provides clean, reliable output that protects the board and downstream components. Generic transformers with the wrong rating can under-power the system or fail prematurely.

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 — 13H28?
Yes. This is the factory-specified OEM transformer for the Lennox OEM Lennox Transformer — 13H28. 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 — 13H28?
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
HVAC Parts Specialist — Online