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If your ignition module is sending voltage but no spark appears at the electrode
leading to more stable flow control
or if testing with a multimeter shows a reading outside the 145-175 microfarad tolerance
it is calibrated to trip when vent temperatures reach 200°F (93°C)
Watts 0590716 Air Vent If your ignition module isThe Watts 0590716 (Series FV 4M1) is a heavy duty 1 4 inch automatic air vent designed for high performance hydronic heating systems. As the direct replacement for the discontinued 590715, this valve is engineered to purge entrapped air from hot or cold water distribution systems automatically. Built with a rugged brass body and cover, it features a high temperature resistant polyethylene float and a durable silicone rubber seal, making it fully
