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Lennox

OEM Lennox Transformer — 47W02

SKU: LNX-47W02 Brand: Lennox
$29.95 $39.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 47W02 transformer supplies the low-voltage control power that runs your Lennox HVAC system. It steps down incoming line voltage to 24 volts, powering the thermostat, control board, gas valve, relays, and contactor. Without a functioning transformer, none of the low-voltage circuits in your furnace or air handler can operate.

Common symptoms of a failed 47W02 include a completely dead thermostat, a system that won't respond to any call for heating or cooling, blown low-voltage fuses, or a burning smell from an overheated winding. A transformer often fails after a short in the thermostat wiring or a shorted gas valve draws excessive current through its secondary side.

OEM matters because the 47W02 is matched to the correct primary voltage, VA rating, and mounting configuration for your Lennox equipment. Using an undersized or mismatched transformer can lead to repeated failures and unreliable control operation. Install the factory-specified replacement to restore dependable 24V control power and get your system running again.

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 — 47W02?
Yes. This is the factory-specified OEM transformer for the Lennox OEM Lennox Transformer — 47W02. 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 — 47W02?
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