meeting UL 353 Limit Control standards for safety-critical monitoring

discoloration at the terminal pins (indicating high heat)

or oil flow

The board utilizes DIP switches located on the PCB

Lennox 99K70 Pump Cartridge Els PW 17895 meeting UL 353 Limit ControlThe Lennox 99K70 Pump Cartridge is a critical OEM replacement part engineered for high performance fluid circulation in specific residential and commercial HVAC units. Designed to meet direct factory specifications, this cartridge ensures the hydraulic integrity of your circulator pump, preventing common mechanical failures that lead to system downtime. Whether you are performing a routine overhaul or responding to a total pump failure, the 99K70