What are the specs for this Limit Switch?

The correct replacement for Goodman model WFM18070S4BXCC — 20162906 is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Goodman equipment which lists the model number WFM18070S4BXCC — 20162906.

What symptoms indicate I need a new limit switch?

Common symptoms that indicate you need a new limit switch include unusual noises, intermittent operation, complete failure to operate, or visible damage. For specific diagnostic guidance, visit nationalhvacparts.com/pages/hvac-diagnostic.

Is this limit switch compatible with Bryant or Payne systems too?

Many Goodman parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

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Goodman

OEM Goodman M4 Primary Limit Switch for WFM18070S4BXCC — 20162906

Name: OEM Goodman M4 Primary Limit Switch for WFM18070S4BXCC — 20162906
Brand: Goodman
SKU: GOODMAN-14088
Price: 19.95 USD
Availability: InStock

SKU: GOODMAN-14088 Brand: Goodman

$19.95 $25.95

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The Goodman 20162906 M4 Primary Limit Switch is a genuine OEM high-limit safety control for the Goodman/Amana WFM18070S4BXCC gas furnace. Mounted on the heat-exchanger/plenum, this primary limit monitors supply-air temperature and opens the control circuit if the furnace overheats — typically from restricted airflow, a dirty filter, or a failed blower. It protects the heat exchanger from thermal damage and prevents unsafe operation, then closes automatically once temperatures return to normal.

Specifications

Part number: 20162906 (M4 series)
Type: Primary high-limit switch
Reset: Automatic (temperature-sensing)
Function: Over-temperature cutout for the control circuit
Fits: WFM18070S4BXCC and related Goodman/Amana furnaces
Terminals: 1/4" quick-connect

OEM vs. Generic

This genuine OEM limit uses the exact trip temperature and sensor length Goodman engineered for this furnace's cabinet. Generic substitutes with different set points or probe depths can cause short-cycling on limit or fail to protect properly. For a primary safety control, OEM is the right call.

Install Difficulty

Easy — Turn off power, unplug the two spade terminals, remove the mounting screws, and install the new switch in the same orientation and probe depth. Roughly 15 minutes. If the limit trips repeatedly after replacement, check filter, blower, and ductwork for airflow restriction before continuing to run the furnace.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $75
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

OEM Goodman M4 Primary Limit Swi...

$19.95

Frequently Asked Questions

Does this Limit Switch fit my Goodman WFM18070S4BXCC — 20162906?

Yes. This is the factory-specified OEM limit switch for the Goodman WFM18070S4BXCC — 20162906. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the limit switch on my Goodman WFM18070S4BXCC — 20162906?

Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.

What symptoms mean I need a new limit switch?

Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.

Is this limit switch compatible with Bryant or Payne too?

Many Goodman parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Goodman limit switch?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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