87F16 Furnace Primary Limit Switch up to 140°F - For Lennox Furnaces - Replaces 87F16 87F1601 L140-30F 36T01B3
87F16 furnace primary limit switch with 140°F sensor mounted on a rectangular base plate.
Dimensional diagram of 87F16 furnace primary limit switch showing measurements in inches.
87F16 furnace primary limit switch rated to 140°F shown in a lifestyle graphic for home heating maintenance.
Close-up detail of 87F16 furnace primary limit switch showing durable aluminum and thermoplastic construction.
87F16 furnace primary limit switch with mounting plate and wiring, showing compatibility and replacement part numbers.
87F16 furnace primary limit switch with white insulated leads and mounting base comparison graphic.
Technician repairing a furnace to fix symptoms like overheating or premature shut-off for 87F16 primary limit switch.
87F16 furnace primary limit switch installation guide with technician and step-by-step instructions.
87F16 furnace primary limit switch with mounting plate and white insulated wires.
87F16 furnace primary limit switch with 140°F sensor mounted on a rectangular base plate.
Dimensional diagram of 87F16 furnace primary limit switch showing measurements in inches.
87F16 furnace primary limit switch rated to 140°F shown in a lifestyle graphic for home heating maintenance.
Close-up detail of 87F16 furnace primary limit switch showing durable aluminum and thermoplastic construction.
87F16 furnace primary limit switch with mounting plate and wiring, showing compatibility and replacement part numbers.
87F16 furnace primary limit switch with white insulated leads and mounting base comparison graphic.
Technician repairing a furnace to fix symptoms like overheating or premature shut-off for 87F16 primary limit switch.
87F16 furnace primary limit switch installation guide with technician and step-by-step instructions.
87F16 furnace primary limit switch with mounting plate and white insulated wires.

87F16 Furnace Primary Limit Switch up to 140°F - For Lennox Furnaces - Replaces 87F16 87F1601 L140-30F 36T01B3

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87F16 Furnace Primary Limit Switch up to 140°F

Key Features

  • Primary high-limit safety control for forced-air furnaces
  • Activates at a fixed temperature of 140°F (60°C) to prevent overheating
  • Automatically resets at 110°F (43°C)
  • Switch configuration: SPST (Single Pole, Single Throw), normally open contacts
  • Probe insertion length: 3 inches

Replaces / Cross-Reference Part Numbers

  • 87F16
  • 87F1601
  • L140-30F
  • L140F-40
  • 36T01B3
  • 42155
  • A1247

Compatibility & Fitment

  • Designed as a direct replacement for specific Lennox brand furnaces.
  • Verify fitment by confirming the part number on your original switch or in your equipment's service manual.

When to Replace

  • Furnace blower runs continuously after the heating cycle has stopped.
  • Heating system short-cycles or shuts down prematurely.
  • Furnace fails to produce heat or ignite the burners.
  • Control board displays a fault code indicating an open limit switch.

Installation Tips

  • Disconnect all electrical power to the furnace before servicing.
  • Locate the limit switch, typically mounted on the furnace plenum near the heat exchanger.
  • Note wire connections before removing the old switch.
  • Install the new switch, secure it with the mounting screws, and reconnect the wires to the terminals.
  • Restore power and test the furnace through a complete heating cycle to ensure proper operation.
87F16 Furnace Primary Limit Switch up to 140°F - For Lennox Furnaces - Replaces 87F16 87F1601 L140-30F 36T01B3 1
87F16 Furnace Primary Limit Switch up to 140°F - For Lennox Furnaces - Replaces 87F16 87F1601 L140-30F 36T01B3 2
87F16 Furnace Primary Limit Switch up to 140°F - For Lennox Furnaces - Replaces 87F16 87F1601 L140-30F 36T01B3 3
87F16 Furnace Primary Limit Switch up to 140°F - For Lennox Furnaces - Replaces 87F16 87F1601 L140-30F 36T01B3 4
  • 87F16 Furnace Primary Limit Switch up to 140°F - For Lennox Furnaces - Replaces 87F16 87F1601 L140-30F 36T01B3 1

    WIDE COMPATIBILITY

    Compatible with many models of Lennox furnaces. Replaces part numbers L140-30F, 87F1601, 36T01B3, L140F-40
  • 87F16 Furnace Primary Limit Switch up to 140°F - For Lennox Furnaces - Replaces 87F16 87F1601 L140-30F 36T01B3 2

    DURABLE MATERIAL

    This part is made of high-quality aluminum alloy and thermoplastic materials for superior conductivity and high reliability
  • 87F16 Furnace Primary Limit Switch up to 140°F - For Lennox Furnaces - Replaces 87F16 87F1601 L140-30F 36T01B3 3

    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
  • 87F16 Furnace Primary Limit Switch up to 140°F - For Lennox Furnaces - Replaces 87F16 87F1601 L140-30F 36T01B3 4

    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

Compatible Models

Locate the model number of your appliance or equipment on the manufacturer's label and use it to check compatibility before ordering

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FAQs

This limit switch is commonly listed for select Lennox furnaces. Match your original part number and furnace model before ordering, since Lennox used different limit switches across product lines.
Known cross-reference numbers for this switch family include 87F16, 87F1601, L140-30F, 36T01B3, and L140F-40. The safest match is the number printed on your original limit switch.
The primary limit switch is a safety control that monitors furnace temperature. If the heat exchanger area gets too hot, the switch opens the circuit to stop burner operation and help prevent overheating.
Common signs include a furnace that starts heating and then shuts down too quickly, burners that cycle off from overheating, or a unit that will not continue a normal heat cycle. However, repeated limit trips are often caused by airflow problems, so the switch should not be replaced until the underlying cause is checked.
Inspect the air filter, blower wheel, supply and return vents, evaporator coil if equipped, and blower motor operation. Restricted airflow is a common reason a furnace overheats and opens the limit switch. Also compare the temperature rating and part number on the old switch to the replacement.
For someone familiar with furnace service, replacement is usually straightforward: disconnect power, access the limit switch, transfer the wire leads, remove the mounting screws, and install the new switch. Typical hand tools are a screwdriver and possibly a nut driver. Many installations take around 10 to 20 minutes once the panel is open.
This switch is associated with a 140°F limit rating in the cross-referenced part family. It is important to replace a limit switch only with one that matches the original temperature rating and configuration, because using the wrong rating can affect furnace safety and operation.