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Why is a hairpin cotter preferred over a standard split cotter
or if you see visible corrosion or "welded" ports near the spark ignitor
The mechanical dial provides straightforward adjustment
Always verify if your local code requires a combination Temperature and Pressure (T&P) valve for your specific water heater application
Common Questions & Technical Insights How do I set the deadband on the DDP-109-203M
Lennox 97L01 Limit Switch 326070-701 Why is a hairpin cotterThe Lennox 97L01 Limit Switch is a critical OEM replacement part engineered for precise thermal regulation in Lennox gas furnaces and air handlers. This L200 30F limit switch is designed to open the electrical circuit if the heat exchanger temperature exceeds its 200F setpoint, preventing mechanical failure and ensuring safe combustion cycles. With a 30F differential for automatic reset, it provides consistent high limit protection and prevents