TRANE 1NT17L-1701 Furnace Limit Switch Checked C340056P02 L170F-30

( Brand: Trane ), ( Manufacturer Part Number: 1NT17L-1701 ), ( Compatible Brand: Trane, American Standard ), ( Type: Limit Switch ), ( Item Length: 3 In ), ( Compatible Product: Central Furnace )

Review TRANE Furnace Limit Switch Oem P02 Checked

The **Trane 1NT17L-1701 Furnace Limit Switch (Part Number C340056P02, P02, L170F-30)** is a precision-engineered safety and control component designed exclusively for Trane s high-efficiency gas furnaces, ensuring optimal performance, energy efficiency, and operational reliability. This limit switch is a critical part of the furnace s internal thermostat and safety circuit, monitoring the temperature of key components such as the heat exchanger, blower motor, and combustion chamber to prevent overheating, overheating-related failures, or dangerous conditions like carbon monoxide leaks. Built to Trane s rigorous engineering standards, this switch features a robust, hermetically sealed construction with a durable bimetallic sensing element that accurately detects temperature fluctuations, providing real-time feedback to the furnace s control board. The **C340056P02** designation indicates it is a **P02 model**, which is specifically calibrated for the **1NT17L series**, ensuring seamless compatibility with the furnace s electronic control system while maintaining the correct voltage and current thresholds for safe operation. The **L170F-30** designation further confirms its application in furnaces with a **170,000 BTU/hr** heating capacity, making it a perfect fit for residential or light-commercial heating systems where precise temperature regulation is essential. Whether installed in a new furnace assembly or as a direct replacement for a failed switch, this limit switch is engineered to withstand the thermal stresses of continuous operation, offering long-term durability and resistance to corrosion, vibration, and electrical interference. By integrating seamlessly with Trane s advanced control logic, it helps maintain efficient combustion, reduces wear on furnace components, and minimizes the risk of costly repairs by promptly shutting down the system if abnormal temperature conditions are detected. For HVAC technicians and homeowners seeking a high-quality, OEM-recommended replacement part, the **Trane 1NT17L-1701 Limit Switch (C340056P02)** delivers both performance and peace of mind, ensuring your heating system operates at peak efficiency while adhering to the strict safety protocols that define Trane s reputation for reliability.

### **Pros and Cons of buying a Trane 1NT17L-1701 Furnace Limit Switch (C340056P02/P02 L170F-30)**

1. **Direct Compatibility** This is an original Trane part designed specifically for the 1NT17L-1701 furnace model, ensuring proper fit and function without modification.

2. **Reliability** Trane is a well-known brand with a reputation for durable heating and cooling equipment, and their limit switches are built to withstand repeated thermal cycling.

3. **Prevents Overheating** A faulty limit switch can cause the furnace to overheat, leading to costly damage. Replacing it with a new, functioning unit restores safety and efficiency.

4. **Energy Efficiency** A properly functioning limit switch ensures the furnace operates within optimal temperature ranges, reducing unnecessary energy consumption.

5. **Warranty Coverage** If purchased from an authorized Trane dealer or through a reputable supplier, the part may still be under warranty, providing added protection.

6. **Easy Installation** Limit switches are relatively straightforward to replace, requiring only basic tools and a few minutes of work, making DIY repairs feasible for those with mechanical experience.

7. **Prevents Future Failures** Addressing a failing limit switch early can avoid more extensive (and expensive) furnace repairs down the line.

1. **Cost** As a genuine Trane part, it may be more expensive than aftermarket or generic alternatives, though quality justifies the price in many cases.

2. **Potential Counterfeit Parts** If purchased from an untrusted seller (e.g., unlicensed online marketplaces), there is a risk of receiving a counterfeit or low-quality part that fails prematurely.

3. **Limited Availability** Older Trane models like the 1NT17L-1701 may not be as widely stocked as newer units, requiring advance ordering or special ordering from suppliers.

4. **Professional Installation May Be Needed** While the replacement is simple, if the furnace has other underlying issues (e.g., dirty burners, clogged filters, or electrical problems), a technician may need to diagnose and address those first.

5. **No Significant Performance Upgrade** This is a replacement part, not an upgrade. It will not improve furnace efficiency or capacity beyond restoring functionality.

6. **Potential for Misdiagnosis** If the limit switch is not the actual cause of the issue (e.g., a faulty thermostat, blower motor, or gas valve), replacing it alone may not resolve the problem.

---

### **Conclusion**

The **Trane 1NT17L-1701 furnace limit switch (C340056P02/P02 L170F-30)** is a **high-quality, reliable replacement part** that ensures safety, efficiency, and longevity for your furnace. Its pros direct compatibility, brand trustworthiness, and preventive maintenance benefits outweigh the cons, which are mostly logistical (cost, availability, or potential counterfeit risks if not sourced carefully).

If your furnace is exhibiting **overheating, error codes, or inconsistent operation**, replacing this switch is a **practical and cost-effective solution** to restore proper function. However, if you re unsure whether the limit switch is the root cause, consulting a **licensed HVAC technician** first can prevent unnecessary expenses.

---

### **Recommendation**

- **Purchase from an authorized Trane dealer, HVAC supply store, or a trusted online retailer** (e.g., Trane s official website, Home Depot, or Lowe s) to avoid counterfeit parts.

- **Verify the part number (C340056P02/P02 L170F-30)** matches your furnace model to ensure compatibility.

- **Follow Trane s installation instructions carefully**, or hire a professional if you lack experience with furnace repairs.

- **Check for underlying issues** (e.g., dirty burners, clogged air filters, or electrical faults) that could contribute to the problem.

- **Consider a furnace tune-up** after replacement to ensure optimal performance and extend the lifespan of your system.

**Final Verdict:** This is a **worthwhile investment** for maintaining your Trane furnace s safety and efficiency, provided you source it from a reputable supplier.

Details:

Many if not most suppliers of HVAC equipment and parts will only sell to licensed contractors. I work for an HVAC company and the majority of parts sell here are used, from equipment i've removed. All parts are packed securely. I do my best to ensure this.

No one else has access to it. Unfortunately people trying to fix their own equipment often purchase the wrong part, or they misdiagnose issue and buy a part that was not what needed equipment, install it incorrectly. Please see the photos. Shipping within the US is either via USPS Ground Advantage or Priority Mail your choice.

Important part numbers and model are included in the listing title, item, specifics. I do not profit from shipping. I still do care that you are pleased and will my best to help. Control boards are wrapped in static guard.

Furnace Limit Switch. Circuit: Normally Closed. Opens on Temperature Rise 200. If you take the time to write, can count on me respond and do my best help.

As many detailed photos .or as much information I do. The number one reason people trying to fix their own equipment are unsuccessful is they purchase the wrong part. After checking, parts are secure until shipping no one else has access to them. This is not a business or parts dealer.

Specifications. Clear photos of the part from multiple angles are included. OEM Trane, American Standard. Closes Resets on Temperature Drop 170.

Packages are addressed clearly, and shipped promptly after purchase. Automatic Reset. For shipping within the USA these are only two options I offer. P/N: C340056P02 P02.

GUARANTEE TO ALL OTHERS: To all others, please understand you are purchasing this at your risk and not mine. After checking and taking photos, it was secure. After checking, they are secure until sold. Insert length : 3.

The best time to do this is before purchase.

part #: 1nt17l1701 prices

• $21.95-$32.98

specifications hvaapa:

• brand: Trane
• mpn: 1nt17l-1701
• compatible brand: Trane, American Standard
• type: Limit Switch
• item length: 3 In
• compatible product: Central Furnace

offer hvaapa:

• options: Ship-to-home
• quantity: 1
• sold: 0
• availability: In Stock
• started: April 27, 2026

shipping hvaapa:

• carrier: USPS
• transit: 4-8 Days
• cost: $0.00
• service: USPS Ground Advantage, USPS Priority Mail
• type: Fixed
• class: Standard, Expedited

seller hvaapa:

• rating: 99.9%
• # reviews: 6950
• city: North Canton, Ohio

returns hvaapa:

• policy: No Returns

general hvaapa:

• HVAC Refrigeration > HVAC Refrigeration: Parts Accessories > HVAC Refrigeration: Controls Circuit Boards
• condition: Used

payments hvaapa:

• other
• wallet: Paypal
• credit card: Diners-club

Trane 1NT17L-1701 Is Similar To:

• 10643 Trane Servicefirst Oem Val Valve Solenoid Way Coil (30.8% similar) Shipped with USPS priority. Service first oem VAL10643, valve solenoid 3 way W/O coil I have the listed in separate offer condition is new...(January 19th, 2019)
• 36g24 205 White Rodgers Oem Natural Gas Valve Trane American Standard (16.8% similar) White Rodgers oem natural gas valve 36G24 205 for Trane american standard new old stock I am cleaning off the shelves and you can benefit...(September 3rd, 2018)
• 36j54-214 Gas Heating Furnace Valve For Goodman Trane York 786710535741 (22.1% similar) ...(March 4th, 2018)
• 41-409 Trane Hot Surface Furnace (28.3% similar) Hello, I am selling 1 furnace ignition for Trane...(January 8th, 2018)
• 5kcp39mgs879s Ge Trane American Standard Oem Blower Motor Mount Hp (24.3% similar) This is a good used Trane, american standard 1/2 hp blower motor and mount. Ge part 5KCP39MGS879S. Trane part D340988P01. FD 370 volt included...(July 24th, 2018)
• 768a-845 White Rodgers Furnace Silcone Nitride Ignitor Fits Trane Ingiter (29.9% similar) Shipped with USPS first class package. 768A-845 furnace silicone nitrite ignite fits Trane B340970P01 IGN00104 inciter. Condition is new...(March 3rd, 2019)
• 5sme39sl0253 Mot09251 Mod00838 Motor Module American Standard D341214p23 Oem Trane (24.4% similar) D341214P23 MOT09251 MOD00838 oem american standard Trane 5SME39SL02531HP120 240 volts tested before removing. Its good to have a spare part even if you dont need it at this time. Super fast shipping. You dont want to get stuck with out heat or air condition and wait for parts to arrive. Variable ...(September 6th, 2016)
• Baylpkt220c Trane Propane Conversion Kit Furnace Burners (27.7% similar) I may repackage this kit using USPS priority mail packaging but will include original label. I ship same day if possible and always within 24 hours...(October 31st, 2018)
• Baysens110a Trane Oem Sen01522 X13790846-01 (29.1% similar) New in original box with packing. Free shipping continental us...(February 17th, 2018)
• Baytr1415brkac Trane Furnace Heat Coil Assembly Fuse (34.9% similar) Trane furnace heat coil assembly 208-240V 1PH BAYHTR1415BRKAC fuse link temp. 128C kilowatt 15...(March 13th, 2019)