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Factory Authorized Parts HH18HA586 Furnace High Limit Safety Switch 180°F Auto Reset

Factory Authorized Parts HH18HA586 Furnace High Limit Safety Switch 180°F Auto Reset

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Regular price $35.00 USD
Regular price Sale price $35.00 USD
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Factory Authorized Parts™ - HH18HA586 Limit Switch

  • Restore System Performance: Replaces faulty switches that cause the furnace to shut down or "short cycle" during the heating process.

  • OEM Safety Standard: Certified Factory Authorized Part ensures the exact thermal setpoints required for Carrier family equipment.

  • Automatic Reset Convenience: Safely restarts the heating cycle once temperatures normalize, preventing unnecessary service calls.

  • Heat Exchanger Protection: Prevents expensive damage by ensuring the furnace never operates at temperatures exceeding 180°F.

  • Durable Construction: High-quality bi-metal sensing element designed for thousands of operational cycles without drifting.

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Specifications

Product Details

  • Brand: Factory Authorized Parts™ (Carrier/Bryant/Payne)
  • Manufacturer: United Technologies / Carrier Corp
  • Part Number: HH18HA586
  • Weight: 0.10 lbs
  • Voltage: 24V (Control Circuit)
  • Amps/Watts: 0.5A @ 24VAC (Pilot Duty)
  • Ignition Type: Compatible with HSI and Spark Ignition systems
  • Open Temperature: 180°F
  • Reset Type: Automatic Reset

description

Factory Authorized Parts™ HH18HA586 Furnace High Limit Safety Switch 180°F Auto Reset 

The Intelligent Thermal Guard

The HH18HA586 is a high-performance primary limit switch (LS1) engineered to serve as the thermal "brain" for the safety circuit in high-efficiency gas furnaces. Designed specifically for the Carrier, Bryant, and Payne furnace families, this component monitors the temperature of the air passing through the heat exchanger. Its critical function is to prevent internal overheating by interrupting the 24V control circuit if temperatures exceed the safe threshold. As a genuine Factory Authorized Part, it ensures that your system maintains its original engineering specifications, protecting the heat exchanger from thermal stress and ensuring long-term system reliability.

Key Features

  • Genuine OEM Part Number: Directly replaces part number HH18HA586, ensuring 100% electrical compatibility and maintaining the manufacturer’s UL safety rating.
  • Precision 180°F Calibration: Calibrated to "open" at exactly 180°F, providing a rapid safety response to restricted airflow or mechanical failure.
  • Automatic Reset Logic: Features an auto-reset bi-metal disc that restores the circuit once the furnace cools to safe operating levels, preventing permanent system lockouts during minor airflow fluctuations.
  • Enhanced Reliability: Engineered to solve "nuisance tripping" and clicking noises caused by aged or weakened thermal discs in older furnace units.
  • Seamless Integration: Designed with standard 1/4" male spade terminals for a secure, vibration-resistant connection to the factory wiring harness.

Product Details

  • Brand: Factory Authorized Parts™ (Carrier/Bryant/Payne)
  • Manufacturer: United Technologies / Carrier Corp
  • Part Number: HH18HA586
  • Weight: 0.10 lbs
  • Voltage: 24V (Control Circuit)
  • Amps/Watts: 0.5A @ 24VAC (Pilot Duty)
  • Ignition Type: Compatible with HSI and Spark Ignition systems
  • Open Temperature: 180°F
  • Reset Type: Automatic Reset

🛠️ HVAC Depot Pro Tip

"Take a Picture First!" Before removing the old switch, photograph the wire colors and the mounting orientation. The HH18HA586 is often mounted in tight spaces where wire reach is limited. After installation, perform a "Static Pressure Check": if this switch continues to trip, it is likely doing its job and signaling that your air filter is too restrictive or your evaporator coil is clogged. Never bypass this switch to achieve heat; it is there to prevent a cracked heat exchanger!

Cross-Reference

  • Superseded Numbers: HH18HA231, HH18HA386
  • Legacy Numbers: 1013454, 313362-431
  • Drawing Numbers: 1NT01L-4375, 95-313362
  • Equivalent Brands: ICP (Heil, Tempstar, Comfortmaker), White-Rodgers / Emerson

Model Compatibility

58STA/STX Series (Suffixes: 045-12, 070-12, 090-14, 110-20, 135-22)

310A/J Series (Suffixes: 024045, 036070, 048090, 066110, 066135)

912S/915S Series (Suffixes: 30040S, 36060S, 42080S, 60100S, 60120S)

PG8M Series (Suffixes: 045045, 070070, 090090, 110110, 135135)

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
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