House Parts [Lifetime Warranty] 20162904 Furnace Primary Limit Switch (150°F to 110°F) - Compatible with Goodman Furnace ACEC960803BNAA ACEC960803BNAB ACSH960453BXAA ACSH960703BXAA
20162904 furnace primary limit switch with metal mounting flange and two electrical terminals.
Dimensional diagram of 20162904 furnace primary limit switch showing product measurements and mounting plate details.
20162904 furnace primary limit switch 150°F to 110°F promotional graphic with product close-up.
Close-up of 20162904 furnace primary limit switch showing durable aluminum and thermoplastic construction.
Infographic showing 20162904 furnace primary limit switch compatibility with Goodman furnace models.
Compatibility chart for 20162904 furnace primary limit switch listing Goodman furnace model numbers.
20162904 furnace primary limit switch shown with technician repairing a furnace and common symptom troubleshooting guide.
Installation guide for 20162904 furnace primary limit switch showing removal, testing, and wiring steps.
20162904 furnace primary limit switch with metal mounting plate and two electrical terminals.
20162904 furnace primary limit switch with metal mounting flange and two electrical terminals.
Dimensional diagram of 20162904 furnace primary limit switch showing product measurements and mounting plate details.
20162904 furnace primary limit switch 150°F to 110°F promotional graphic with product close-up.
Close-up of 20162904 furnace primary limit switch showing durable aluminum and thermoplastic construction.
Infographic showing 20162904 furnace primary limit switch compatibility with Goodman furnace models.
Compatibility chart for 20162904 furnace primary limit switch listing Goodman furnace model numbers.
20162904 furnace primary limit switch shown with technician repairing a furnace and common symptom troubleshooting guide.
Installation guide for 20162904 furnace primary limit switch showing removal, testing, and wiring steps.
20162904 furnace primary limit switch with metal mounting plate and two electrical terminals.
Lifetime Warranty

[Lifetime Warranty] 20162904 Furnace Primary Limit Switch (150°F to 110°F) - Compatible with Goodman Furnace ACEC960803BNAA ACEC960803BNAB ACSH960453BXAA ACSH960703BXAA

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20162904 Furnace Primary Limit Switch

Key Features

  • Temperature Range: Opens at 150°F (65.5°C) and closes at 110°F (43.3°C).
  • Function: Monitors plenum temperature and automatically shuts down the furnace if it exceeds the high limit, preventing overheating.
  • Construction: Made from aluminum alloy and thermoplastic materials for durability and reliable conductivity.
  • Type: Primary high-limit temperature control switch.

Replaces / Cross-Reference Part Numbers

  • 20162904
  • 20162904S
  • L40-524
  • L40524

Compatibility & Fitment

  • Designed for use in various Goodman brand furnaces.
  • Verify the part number in your appliance's service manual to ensure proper fitment.

When to Replace

  • The furnace cycles on and off frequently without reaching the set temperature.
  • The indoor blower motor runs continuously.
  • The furnace fails to ignite or produce heat.

Installation Tips

  • Disconnect all electrical power to the furnace before servicing.
  • Confirm the temperature ratings of the replacement switch match the original part.
  • Note the position of the electrical connections before removing the old switch.
  • Installation by a qualified service technician is recommended.
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  • WIDE COMPATIBILITY

    WIDE COMPATIBILITY

    Compatible with many models of Goodman furnaces. Replaces part numbers: 20162904 and L40-524
  • DURABLE MATERIAL

    DURABLE MATERIAL

    This part is made of high-quality aluminum alloy and thermoplastic materials for superior conductivity and high reliability.
  • SAVING SOLUTION

    SAVING SOLUTION

    Enjoy the great feeling when your furnace is repaired and works properly like before. BlueStars brings DIY solutions to help you deal with any trouble
  • IMPORTANT NOTE

    IMPORTANT NOTE

    This is a replacement part designed to be compatible with certain appliances. Any brand names mentioned are used solely to indicate compatibility.
CONNECTING LIVES, ENERGIZING MOMENTS

CONNECTING LIVES, ENERGIZING MOMENTS

FAQ

This primary limit switch is designed for Goodman furnaces requiring part number 20162904. It is compatible with models including ACEC960803BNAA, ACEC960803BNAB, ACSH960453BXAA, and ACSH960703BXAA. Because limit switches must match the furnace's temperature rating and mounting style, the safest way to confirm fit is to check your unit's model number and the number printed on the original switch.
This part replaces OEM number 20162904 and cross-references with L40-524 and 36TXV41-13881. Always match both the part number and the temperature rating on your existing switch before ordering.
This is a furnace safety switch that monitors heat in the furnace. When the temperature rises to approximately 150°F, the switch opens to protect the furnace from overheating. It resets automatically once the temperature drops to approximately 110°F. If the switch opens, the burner will shut off until conditions return to a safe operating range.
Common symptoms include a furnace that starts and then shuts the burners off prematurely, short cycling, no heat, or a fault code indicating an open limit circuit. Keep in mind that the switch is often performing its safety function due to an underlying issue, such as restricted airflow or overheating, rather than a failure of the switch itself.
The most common cause is overheating. This can be triggered by a dirty air filter, blocked supply or return vents, a clogged evaporator coil, a weak blower motor, incorrect blower speed, or issues with venting and combustion airflow. Replacing the switch without correcting the root cause of the overheating will likely result in the new switch tripping as well.
Always turn off power to the furnace before beginning. Before replacing the switch, inspect the air filter, blower wheel, blower motor operation, venting, and any blocked registers or returns. Compare the old switch's part number, temperature rating, terminal style, and mounting position to the replacement. If the furnace has been overheating repeatedly, diagnose the airflow or venting issue before restoring service.
On many furnaces, this is a straightforward repair if the switch is easily accessible. Typical tools required include a screwdriver and potentially needle-nose pliers for the wire terminals. The replacement process usually takes between 15 and 30 minutes. Be sure to label wires before removal and install the new switch in the same orientation as the original.