What amp contactor do I need for my National HVAC Parts system?

The correct replacement for National HVAC Parts model 2-Pole 40A 24V AC Contactor — Universal HVAC Replacement 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 National HVAC Parts equipment which lists the model number 2-Pole 40A 24V AC Contactor — Universal HVAC Replacement.

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.

Is this contactor compatible with Bryant or Payne systems too?

Many National HVAC Parts parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

National HVAC Parts

2-Pole 40A 24V AC Contactor — Universal HVAC Replacement

Name: 2-Pole 40A 24V AC Contactor — Universal HVAC Replacement
Brand: National HVAC Parts
SKU: NHVAC-CON-2P-40A
Price: 24.99 USD
Availability: InStock

SKU: NHVAC-CON-2P-40A Brand: National HVAC Parts

$24.99 $36.99

Order before 3PM CST — ships same day.
Standard delivery 2-5 business days. Express options at checkout.

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Double-pole 40 amp definite purpose contactor with 24V AC coil. Universal replacement for large residential AC 3-5 tons. The contactor is the main power relay — when the thermostat calls for cooling, it sends high-voltage power to the compressor and fan motor.

When to replace: AC hums but won't start, outdoor unit buzzes without fan spinning, visible pitting on contact points, contactor chatters or sticks.

Rating: 40A FLA, 2-Pole
Coil Voltage: 24V AC
Type: Definite Purpose Contactor
Application: large residential AC 3-5 tons
Warranty: 1-year replacement warranty

Install difficulty: 2/5 — Disconnect power at breaker. Photo existing wiring. Remove wires and mounting screws. Swap and reconnect. 15-20 minutes.

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 Contactor fit my National HVAC Parts 2-Pole 40A 24V AC Contactor — Universal HVAC Replacement?

Yes. This is the factory-specified OEM contactor for the National HVAC Parts 2-Pole 40A 24V AC Contactor — Universal HVAC Replacement. 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 National HVAC Parts 2-Pole 40A 24V AC Contactor — Universal HVAC Replacement?

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 National HVAC Parts 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 National HVAC Parts 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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2-Pole 40A 24V AC Contactor — Universal HVAC Replacement

Shipping Information

Return Policy

Frequently Asked Questions