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78L29 is an official OEM Rollout Limit Switch w/ Manual Reset (Opens at 250 F) for Lennox HVAC equipment.
Key Features:
- Official OEM flame sensor for Carrier HVAC equipment (as described on the product listing)
- Listed as replacing part number LH680014
- Customer reviews describe it as an OEM-correct fit, with some noting an "extra pigtail" included
Compatibility & Applications:
- Listed for Carrier HVAC equipment (model-specific compatibility is not provided in the listing details)
- Must only be used where the manufacturer specifies this exact part number: LH680534 (confirm by the unit's model/serial and the applicable service/parts documentation)
User Reviews & Q&A Summary:
- Reviews commonly describe:
- - Perfect/OEM fit and being the correct replacement part
- - Easy installation for those performing the repair
- - Keeping a spare flame sensor (and often an ignitor) on hand for quicker winter repairs (review-reported)
- - Positive feedback on shipping speed, packaging, and overall purchase experience
Maintenance & Troubleshooting:
- The provided sources do not include formal diagnostic procedures for this flame sensor
- Reviews reflect replacement as a practical service repair (OEM part swap), with users reporting successful replacement experiences and restored confidence in having the correct part on hand
Certifications & Compliance:
- Meets ARI 780/790 Standard
User Reviews & Q&A Summary:
- Common theme is "correct part" for the intended replacement, with users reporting it worked as expected after installation
- Review feedback frequently mentions straightforward installation for a direct replacement
- Value and fulfillment are recurring positives (good deal/price and fast shipping)
Product Highlights
0.25 A @ 0.25 to 12 Vdc, 5.1A @ 240 Vac, 8A @ 120 Vac   
Fixed    
SPST, Contacts Break on Temp Rise    
Horizontal, Vertical    
5-5/8" Â Â Â 
2-1/8" DepthSpecs
| Application: | High Limit Low Limit |
|---|---|
| Bulb Size: | 3/8" x 2-7/8" |
| Capillary Length: | 3" |
| Switch Action: | SPST Contacts Break on Temp Rise |
| Electrical Rating: | 0.25 A @ 0.25 to 12 Vdc 5.1A @ 240 Vac 8A @ 120 Vac |
| Electrical Ratings (ALR): | 48A @ 120 Vac 30.6A @ 240 Vac |
| Max Temp Differential: | 2°F |
| Differential: | Fixed |
| Max Ambient Temp (°F): | 150°F |
| Height: | 5-5/8" |
| Width: | 2" |
| Depth (Inches): | 2-1/8" |
| Well Included: | No |
| Mount: | Horizontal Vertical |
| Temperature Range (F): | 40°F to 180°F |
Reviews
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