What are the specs for this Thermostat?

The correct replacement for Tempstar model TNLS2035HDE — OEM Limit Switch | Ships Today 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 Tempstar equipment which lists the model number TNLS2035HDE — OEM Limit Switch | Ships Today.

What symptoms indicate I need a new thermostat?

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

Is this thermostat compatible with Bryant or Payne systems too?

Many Tempstar 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.

Tempstar

Tempstar Safety Thermostat for TNLS2035HDE — OEM Limit Switch | Ships Today

Name: Tempstar Safety Thermostat for TNLS2035HDE — OEM Limit Switch | Ships Today
Brand: Tempstar
SKU: 51302031100-GEN
Price: 32.00 USD
Availability: InStock

SKU: 51302031100-GEN Brand: Tempstar

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Overview

This OEM safety thermostat (part 51302031100, "TSTAT SAFETY") is the temperature-limit protection switch for your Tempstar TNLS2035HDE. It is a snap-disc style control that monitors a critical temperature and opens the circuit if a high-limit condition is reached, protecting the compressor, coil, and electrical components from damage caused by overheating or abnormal operating conditions. When this safety fails open it can prevent the system from running at all; when it sticks closed it removes a key layer of protection. Replacing a faulty safety thermostat restores correct cutout behavior and keeps the unit operating within its design limits.

Specifications

Spec	Value
Part Number	51302031100
Type	Safety / Limit Thermostat (Snap-Disc)
Brand	Tempstar
Function	High-Limit Temperature Protection
Control Circuit	24V

Compatibility

Direct OEM replacement safety thermostat for the Tempstar TNLS2035HDE and matching ICP/Heil/Comfortmaker units. Confirm the trip temperature and terminal style against the part you are removing.

Installation Guide

Safety First — Disconnect power and verify zero voltage with a multimeter.
Access — Remove the service panel to reach the safety thermostat.
Document — Photograph the wire connections and mounting location.
Remove — Disconnect the leads, unfasten the switch from its mounting surface, and note its orientation.
Install — Mount the new safety thermostat in the same position and reconnect the leads per your photo.
Test — Restore power and confirm the system completes a normal cycle without nuisance tripping.

Signs You Need a Replacement

Unit will not start or trips out on a safety/limit fault.
Intermittent shutdowns during normal operation.
Switch fails a continuity test at room temperature.
Visible burning, corrosion, or cracked disc housing.

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.

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

Tempstar Safety Thermostat for T...

$32.00

Frequently Asked Questions

Does this Thermostat fit my Tempstar TNLS2035HDE — OEM Limit Switch | Ships Today?

Yes. This is the factory-specified OEM thermostat for the Tempstar TNLS2035HDE — OEM Limit Switch | Ships Today. 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 thermostat on my Tempstar TNLS2035HDE — OEM Limit Switch | Ships Today?

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 thermostat?

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

Is this thermostat compatible with Bryant or Payne too?

Many Tempstar 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 Tempstar thermostat?

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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