House - Furnace Parts [Lifetime Warranty] 20162904 Furnace Primary Limit Switch 150°F to 110°F
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

Save 13%
0.00
$36.09
$41.50
$36.09
In stock
Fast delivery

Secure and trusted checkout with

  • Visa
  • Mastercard
  • American Express
  • PayPal
  • Diners Club
  • Discover
Contact for wholesale
🛠️
CONFIRM THE FIT FOR YOUR MODEL
Enter your model number

20162904 Furnace Primary Limit Switch 150°F to 110°F

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

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.
Product image 1
Product image 2
Product image
Product image
  • 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 used on certain Goodman furnaces that call for part number 20162904. Search results also show it used on Goodman models such as 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.
The confirmed part number is 20162904. Search results also show cross-references L40-524 and 36TXV41-13881. Match both the part number and the temperature rating on the old switch before ordering.
This is a furnace safety switch that monitors heat in the furnace. When temperature rises to about 150°F, the switch opens to protect the furnace from overheating. It resets after temperature drops to about 110°F. If the switch opens, the burner may shut off until conditions return to a safe range.
Common symptoms include a furnace that starts and then shuts the burners off early, short cycling, no heat, or a fault code related to limit circuit open. Keep in mind the switch is often doing its job because of another problem, such as restricted airflow or overheating, not necessarily because the switch itself has failed.
The most common cause is overheating. That can be caused by a dirty air filter, blocked supply or return vents, a clogged evaporator coil, a weak blower motor, incorrect blower speed, or venting and combustion airflow problems. Replacing the switch without correcting the overheating condition can cause the new one to trip again.
Turn off power to the furnace first. Before replacing the switch, inspect the air filter, blower wheel, blower motor operation, venting, and any blocked registers or returns. Also compare the old switch's part number, temperature rating, terminal style, and mounting position to the replacement. If the furnace has been overheating repeatedly, it is a good idea to diagnose the airflow or venting issue before restoring service.
On many furnaces, this is a straightforward repair if the switch is easy to access. Typical tools are a screwdriver and possibly needle-nose pliers for the wire terminals. Replacement often takes about 15 to 30 minutes. Be sure to label wires before removal and install the new switch in the same orientation as the original.