Michel & Siso are very knowledgeable and explain everything to where I could understand! Amazing experience! Thank you will always come here for any AC needs. Trustworthy and excellent customer service.

Celest G.
Verified Customer

4.9/5 based on 4750 reviews

Factory Authorized Parts™ HH18HA508 SWITCH LIMIT (LS1) 120-160°F Auto Reset

Factory Authorized Parts™ HH18HA508 SWITCH LIMIT (LS1) 120-160°F Auto Reset

In stock

Regular price $35.00 USD
Regular price Sale price $35.00 USD
Sale Sold out
Shipping calculated at checkout.

Factory Authorized Parts™ - HH18HA508 SWITCH LIMIT (LS1)

  • Prevent Overheating Lockouts: Replaces worn switches that cause the furnace to shut down prematurely during long heating cycles.

  • OEM Efficiency Ratings: Using the exact Factory Authorized Part ensures your furnace maintains its original AFUE efficiency and safety certifications.

  • Automatic System Recovery: Eliminates the need for manual resets, allowing the furnace to restart itself safely once airflow is restored.

  • Reliable Thermal Sensing: High-quality bi-metal construction provides years of accurate temperature monitoring in high-heat environments.

  • Universal Carrier Family Fit: Certified for use across the entire Carrier, Bryant, and Payne furnace lineup for guaranteed compatibility.

Please visit our store for pick up.

Quantity

safe & secure Checkout

Fast & Tracked Delivery
30 Day money back guarantee

Specifications

Product Details

  • Brand: Factory Authorized Parts™ (Carrier/Bryant/Payne)
  • Manufacturer: Carrier Corporation
  • Part Number: HH18HA508
  • Weight: 0.02 lbs
  • Voltage: 120V / 24V (Pilot Duty)
  • Amperage: 0.84 amp
  • Reset Type: Automatic Reset
  • Temperature Range: 120°F Cut-In / 160°F Cut-Out
  • Dimensions: 1" Depth x 4" Height x 9" Width (Package size) 

description

Factory Authorized Parts™ HH18HA508 SWITCH LIMIT (LS1) 120-160°F Auto Reset

The Intelligent Thermal Regulator

The HH18HA508 is a critical "LS1" primary limit switch engineered to serve as the thermal safety brain for high-performance gas furnaces. Designed specifically for Carrier, Bryant, and Payne equipment, this automatic reset switch monitors the temperature of the air passing over the heat exchanger. Its primary function is to prevent system overheating by interrupting the heating cycle if temperatures exceed safe operating parameters. By ensuring the furnace stays within its engineered 120°F to 160°F window, it preserves the integrity of the heat exchanger and maintains the peak efficiency of your HVAC system. 

Key Features

  • Exact OEM Part Number: A genuine HH18HA508 Factory Authorized Part, ensuring 100% mechanical and electrical compatibility with your specific furnace cabinet.
  • Automatic Reset Logic: Unlike rollout switches, this "LS1" limit features an auto-reset function that restores furnace operation once internal temperatures cool to the safe "cut-in" threshold.
  • Dual-Point Thermal Control: Precision-calibrated to open at 160°F (interrupting heat) and close at 120°F (resuming operation), providing a reliable safety buffer.
  • Integrated Safety Monitoring: Continuously communicates with the furnace control board to prevent heat-related damage and ensure the system shuts down safely if airflow is restricted.
  • Quick-Connect Installation: Features standard spade terminals for a fast, secure connection to the existing safety circuit, resolving nuisance tripping caused by aging, "weak" switches. 

Product Details

  • Brand: Factory Authorized Parts™ (Carrier/Bryant/Payne)
  • Manufacturer: Carrier Corporation
  • Part Number: HH18HA508
  • Weight: 0.02 lbs
  • Voltage: 120V / 24V (Pilot Duty)
  • Amperage: 0.84 amp
  • Reset Type: Automatic Reset
  • Temperature Range: 120°F Cut-In / 160°F Cut-Out
  • Dimensions: 1" Depth x 4" Height x 9" Width (Package size) 

🛠️ HVAC Depot Pro Tip

"Check the Filter Before Replacing!" If your furnace is short-cycling and you suspect the HH18HA508 has failed, first check for restricted airflow. A dirty air filter, blocked return vents, or a dusty evaporator coil are the most common reasons this switch trips. Before installing the new part, take a picture of the mounting orientation; ensure the bi-metal sensing element is fully inserted into the airflow stream for accurate temperature detection.

Cross-Reference

  • Superseded / Legacy Numbers: HH18HA508A
  • Manufacturer Codes: 1NT01L-4577, 4349808
  • UPC/Drawing Numbers: 00662442666758, L/1 

Model Compatibility

58STA/STX Series (Suffixes: 070-14116, 070-16108, 070-16112, 070-12116, 070-13116)

58SB/SC Series (Suffixes: 0A090E211116, 0A070E171212, 0A090E211116, 0B090M171114, 1A070E171116)

58PHB/PHA Series (Suffixes: 070-10116, 070-10112, 090-10114, 090-10116, 110-10120, 110-12120)

PG8M/PG80 Series (Suffixes: EA048070AAJA, JAA048070ACJA, ESAA48090CBA, ESAA42090BBA, MAA048070ADJA)

801SA/811SA Series (Suffixes: 36070E17A-A, 42090E17A-C, 48090E21A-C, 60155E24A-A)

 

Specification

Refund policy

Refund & Return Policy

Last Updated: June 2026

At HVAC Parts & Equipment Depot, customer satisfaction is important to us. This Refund & Return Policy explains how returns, exchanges, and refunds are handled for purchases made through TopHVACParts.com.

Return Eligibility

We accept returns within 30 days of delivery.

To qualify for a return:

  • The item must be unused, uninstalled, and in its original condition.
  • The item must be returned in its original packaging.
  • Model numbers and serial numbers must match the original purchase records.
  • Proof of purchase or order confirmation is required.

Non-Returnable Items

The following items are not eligible for return or refund:

  • Installed or used parts.
  • Products showing signs of installation, modification, or damage caused after delivery.
  • Items missing original packaging.
  • Sale or clearance items.
  • Special-order or custom-order products.
  • Returns requested more than 30 days after delivery.

Restocking Fee

Approved returns may be subject to a 20% restocking fee.

The restocking fee will be deducted from the refund amount after the returned item has been inspected and approved.

Damaged, Defective, or Incorrect Items

If you receive a damaged, defective, or incorrect item, please contact us within 7 days of delivery.

Email: support@tophvacparts.com
Phone: (214) 734-5222

We may request photographs and additional information to help process your claim.

If the claim is approved, we will provide a replacement, exchange, or refund at no additional cost to you.

Exchanges

We replace items only if they are defective, damaged upon arrival, or incorrectly shipped.

To request an exchange, contact us at:

support@tophvacparts.com

Refund Process

Once your return is received and inspected, we will notify you by email regarding approval or rejection of your refund request.

If approved:

  • Refunds will be issued to the original payment method.
  • Processing typically takes 7–14 business days after approval.
  • Your financial institution may require additional time before the refund appears in your account.

Return Shipping

Customers are responsible for return shipping costs unless the return is the result of:

  • Our shipping error,
  • A defective product,
  • A damaged product received upon delivery.

Original shipping charges are non-refundable.

We recommend using a trackable shipping service and purchasing shipping insurance for higher-value items.

Return Address

HVAC Parts & Equipment Depot
1135 E Plano Parkway, Suite 8
Plano, TX 75074
United States

Professional Installation Notice

Many HVAC products require installation by a licensed HVAC professional.

HVAC Parts & Equipment Depot is not responsible for damages resulting from improper installation, misuse, unauthorized modifications, or failure to follow manufacturer instructions.

Special Orders

Special-order products must be picked up within 30 days of purchase unless other arrangements have been approved.

Unclaimed special-order products may be returned to the manufacturer and may be subject to applicable restocking fees.

Contact Us

If you have questions regarding returns, refunds, or exchanges, please contact us:

HVAC Parts & Equipment Depot

Phone: (214) 734-5222
Email: support@tophvacparts.com

Michel & Siso are very knowledgeable and explain everything to where I could understand! Amazing experience! Thank you will always come here for any AC needs. Trustworthy and excellent customer service.

Celest G.
Verified Customer
View full details

Happy Shouts From Our Thrilled Customers

YOU MAY ALSO LIKE

Explore More Products

HVAC Parts and Equipment Depot

Frequently Asked Questions

Questions? We’ve got you covered

We are open to the public! Homeowners, landlords, and DIYers are all welcome—no license required.

We carry blower motors, fan motors, capacitors, control boards, contactors, thermostats, filters, copper lines, refrigerants, and more.

Yes, we stock OEM and compatible replacement parts for major brands including Trane, Goodman, Lennox, Carrier, Rheem, and others.

Absolutely! Bring in the part, model number, or a picture, and our team will help match you with the correct replacement.

Yes, we accept returns or exchanges within a set time period—just make sure the item is unused and in original packaging. Ask for specific terms at the counter.

While we don't install, we can answer basic questions and refer you to trusted local HVAC technicians if needed.

We sell certain refrigerants, but EPA regulations require certification for purchase of products like R-410A or R-22.

We offer both! You can shop in person or call to arrange shipping if you're out of town.