Lennox 10D83 (240009128) is an OEM high-limit control designed to protect Lennox hydronic boiler systems from overheating. This safety device continuously monitors boiler water temperature and automatically interrupts operation if the temperature exceeds the factory-set limit. It is specifically engineered for use in Lennox COWB3 and OWB86 boiler models, ensuring proper fit, accurate temperature sensing, and reliable long-term performance.

Manufactured to Lennox OEM standards, this limit control plays a critical role in maintaining safe boiler operation, preventing system damage, and extending overall equipment life. It is an essential replacement component during boiler service, safety repairs, or preventative maintenance.

Product overview
Lennox 10D83 limit control is used as a high-temperature safety switch in compatible Lennox boilers. Once the preset temperature limit is reached, the control opens the circuit to stop boiler operation until safe conditions are restored.

 

Key features:

OEM Lennox replacement part
Designed for precise temperature monitoring
Helps prevent boiler overheating
Restores factory safety protection
Direct replacement with no modifications required

 

Compatible boiler models:

Lennox COWB3 series boilers
Lennox OWB86 series boilers

 

Part information:

Brand: Lennox
Lennox part number: 10D83
Alternate / factory number: 240009128
Product type: Boiler limit control / high-limit switch

Typical applications:

Hydronic boiler safety control
Boiler overheating protection
OEM replacement during service or repair