What amp contactor do I need for my Lennox system?

The correct replacement for Lennox model OEM Lennox Contactor 3-Pole 25A w/ Aux — 17F64 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 3-Pole 25A w/ Aux — 17F64.

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 3-Pole 25A w/ Aux — 17F64

Name: OEM Lennox Contactor 3-Pole 25A w/ Aux — 17F64
Brand: Lennox
SKU: LNX-17F64
Price: 28.95 USD
Availability: InStock

SKU: LNX-17F64 Brand: Lennox

$28.95 $38.95

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The genuine OEM Lennox 17F64 is a 3-pole contactor rated for 25 amps and equipped with an auxiliary contact, designed to switch power to the compressor and fan motor in your Lennox outdoor unit. The added auxiliary contact provides a secondary switching circuit — commonly used to signal or control an accessory load, such as a crankcase heater or status feedback — alongside the main power poles. When the control coil is energized, the main contacts close to deliver line voltage while the aux contact changes state in step.

Common failure symptoms: welded or burned main contacts that keep the unit running continuously, a coil that hums but won't pull in, an auxiliary circuit that no longer switches, no-start compressor conditions, and arcing or discoloration at the terminals. Any of these indicates the contactor has reached the end of its service life.

Why OEM matters: the Lennox 17F64 is built to the precise amperage, coil, and auxiliary-contact configuration your equipment was engineered around. Aftermarket contactors often lack the correct aux contact or rating, causing accessory circuits to malfunction. Genuine OEM ensures full compatibility, reliable operation, and continued Lennox warranty protection.

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 3-Pole 25A ...

$28.95

Frequently Asked Questions

Does this Contactor fit my Lennox OEM Lennox Contactor 3-Pole 25A w/ Aux — 17F64?

Yes. This is the factory-specified OEM contactor for the Lennox OEM Lennox Contactor 3-Pole 25A w/ Aux — 17F64. 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 3-Pole 25A w/ Aux — 17F64?

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 3-Pole 25A w/ Aux — 17F64

Shipping Information

Return Policy

Frequently Asked Questions