If the flame sensor integrated into the electrode is dirty or if there is a grounding issue

showing high

preventing air leaks and ensuring the safety interlock switches function correctly

While a faulty coil in the gas valve is a common cause

Siemens Industrial Controls 3UG5512-1AR20 Monitor Relay R-448A If the flame sensor integratedThe Siemens 3UG5512 1AR20 is a high performance digital line monitoring relay designed for precise supervision of three phase systems in demanding industrial and HVACR environments. Engineered for versatility, this unit supports a broad line voltage range of 160V to 690V AC, making it a reliable solution for monitoring phase sequence, phase failure, and phase asymmetry. Its digital interface allows for granular adjustment of undervoltage and