What amp contactor do I need for my Lennox system?

The correct replacement for Lennox model OEM Lennox Contactor — 10F73 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 Lennox equipment which lists the model number OEM Lennox Contactor — 10F73.

My AC clicks but the compressor does not turn on. What is wrong?

Clicking from the outdoor unit without the compressor starting usually means a worn contactor. The contactor is the relay that sends power to the compressor. When its contacts are pitted or worn, it clicks but cannot establish a solid electrical connection. Other symptoms: visible pitting or burn marks on the contactor face, AC works intermittently, or buzzing from the contactor.

Lennox

OEM Lennox Contactor — 10F73

Name: OEM Lennox Contactor — 10F73
Brand: Lennox
SKU: LNX-10F73
Price: 28.95 USD
Availability: InStock

SKU: LNX-10F73 Brand: Lennox

$28.95 $38.95

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The genuine OEM Lennox 10F73 contactor is the electrical switch that energizes your outdoor unit's compressor and condenser fan motor. When the thermostat calls for cooling, the 24V control coil pulls the contacts closed, delivering line voltage to the high-draw components. As one of the hardest-working parts in the system, the contactor cycles thousands of times per season and is a common wear item.

Signs of a failing contactor include an outdoor unit that won't start, humming or chattering at the condenser, pitted or burned contacts, or a system that runs continuously because the contacts have welded shut. Ants and debris lodged in the contactor can cause the same symptoms.

Installing the OEM 10F73 ensures the correct coil voltage, contact rating, and amperage capacity for your Lennox equipment. Off-brand contactors often carry mismatched ratings that fail early or overheat under load. This factory-spec replacement restores reliable, safe switching and protects the expensive compressor it controls.

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 Lennox Contactor — 10F73

$28.95

Frequently Asked Questions

Does this Contactor fit my Lennox OEM Lennox Contactor — 10F73?

Yes. This is the factory-specified OEM contactor for the Lennox OEM Lennox Contactor — 10F73. 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 contactor on my Lennox OEM Lennox Contactor — 10F73?

Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Open condensing unit panel. Step 3: Photograph ALL wiring on the contactor. Step 4: Label each wire with tape. Step 5: Disconnect wires and remove old contactor. Step 6: Mount new contactor, reconnect wires matching your photo. Step 7: Restore power and test.

My AC clicks but the compressor won’t turn on. What’s wrong?

Clicking from the outdoor unit without the compressor starting = worn contactor. The contactor sends power to the compressor. When its contacts are pitted, it clicks but can’t make solid contact. Look for: visible pitting/burn marks on the contactor face, intermittent operation, or buzzing.

Is this contactor 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 contactor?

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 Lennox Contactor — 10F73

Shipping Information

Return Policy

Frequently Asked Questions