Why is my solenoid valve humming or buzzing

Smith 100093631 Ignitor is a critical hot surface igniter replacement designed for high-efficiency gas-fired equipment

Direct Compatibility: Replaces legacy part numbers 308090-403 and 308570-303

reducing unnecessary service calls for simple thermal fluctuations

and typical rooftop unit (RTU) configurations

Siemens Building Technology 658-0052 Valve R-22 Why is my solenoid valveThe Siemens Building Technology 658 0052 Valve is a professional grade 1 2 inch 3 way changeover valve engineered for precise fluid management in hydronic HVAC systems. Designed as part of the Siemens Powertop series, this valve features a 2. 5 Cv flow coefficient and a quick opening flow characteristic, making it an ideal choice for 4 pipe radiant panel applications and terminal unit control. The 658 0052 is strictly a non mixing changeover valve,