Resideo Q309A1970 Thermocouple 320735-701 It prioritizes system safety by

It prioritizes system safety by continuously monitoring flame rectification currents and safety limit strings

it’s time to swap the contactor

but most standard Carrier EAC units use multiple wires per cell

While light oxidation can sometimes be removed with a dollar bill or very fine emery cloth

Resideo Q309A1970 Thermocouple 320735-701 It prioritizes system safety byThe Resideo Q309A1970 Thermocouple is a high performance pilot flame detector designed for standing pilot systems in residential and commercial gas fired equipment. This 30 millivolt heavy duty thermocouple features a 24 inch lead and a standardized split nut connection for a secure fit to the gas control valve. It is engineered to provide precise millivolt output, typically between 26mV and 32mV open circuit, ensuring the safety string remains closed