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OEM Lennox Blower Relay — 43H89
Lennox

OEM Lennox Blower Relay — 43H89

SKU: LNX-43H89 Brand: Lennox
$24.95 $34.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 43H89 blower relay switches line-voltage power to the indoor blower motor on command from the furnace control board or thermostat. This electromechanical component energizes the blower for heating, cooling, and continuous-fan operation, making it essential to consistent, properly timed airflow in your Lennox system.

Common failure symptoms: a blower that won't start or runs continuously, weak or no airflow at the registers, a chattering or buzzing relay, intermittent fan operation, or burnt and pitted contacts. A failed 43H89 can leave the heat exchanger without airflow and trip the high-limit switch, causing nuisance shutdowns.

Why OEM matters: the 43H89 is rated to the exact coil voltage and contact amperage your Lennox equipment requires. Substitute relays may have mismatched ratings or terminal layouts that overheat, weld shut, or fail prematurely. This factory-spec relay delivers dependable switching, correct blower timing, and long service life, keeping your system's airflow safe and reliable.

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 Relay fit my Lennox OEM Lennox Blower Relay — 43H89?
Yes. This is the factory-specified OEM relay for the Lennox OEM Lennox Blower Relay — 43H89. 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 relay on my Lennox OEM Lennox Blower Relay — 43H89?
Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.
What symptoms mean I need a new relay?
Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.
Is this relay 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 relay?
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