What are the specs for this Limit Switch?

The correct replacement for Goodman model WFM18090S5CXCC — 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 WFM18090S5CXCC — 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 WFM18090S5CXCC — 20162906

Name: OEM Goodman M4 Primary Limit Switch for WFM18090S5CXCC — 20162906
Brand: Goodman
SKU: GOODMAN-14128
Price: 29.95 USD
Availability: InStock

SKU: GOODMAN-14128 Brand: Goodman

$29.95 $39.95

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Texas CMBL #19328542014

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The Goodman 20162906 M4 Primary Limit Switch is a genuine OEM temperature control for the WFM18090S5CXCC gas furnace and compatible Goodman/Amana units. Mounted on the heat exchanger or blower deck, the primary limit continuously monitors supply-air temperature. If airflow drops or the furnace overheats, the switch opens to cut the burners and protect the heat exchanger, then automatically re-closes once temperatures return to a safe range.

Specifications

Part Number: 20162906
Series: M4 primary limit
Type: Automatic-reset high-limit switch
Contacts: Normally closed (opens on over-temperature)
Function: Primary overheat/airflow safety protection
Fits: WFM18090S5CXCC and related Goodman furnaces

OEM vs. Generic

Primary limits are matched to the furnace's specific trip temperature and mounting footprint. This OEM 20162906 M4 switch delivers the factory-calibrated open point, avoiding both nuisance short-cycling and unsafe late trips. Generic substitutes often differ in set point or bracket shape. For reliable protection, OEM is recommended.

Install Difficulty

Easy. A common quarter-turn or two-screw mounted switch with spade terminals. Shut off power and gas, photograph the wiring, remove the old limit, and install the replacement in the same orientation. Roughly 15–20 minutes. Persistent tripping indicates an airflow problem worth a professional check.

Do not jumper or defeat the primary limit — it safeguards the heat exchanger.

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...

$29.95

Frequently Asked Questions

Does this Limit Switch fit my Goodman WFM18090S5CXCC — 20162906?

Yes. This is the factory-specified OEM limit switch for the Goodman WFM18090S5CXCC — 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 WFM18090S5CXCC — 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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