What causes the capillary to fail on these high-limit switches

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How do I troubleshoot a failing 1980-060 thermocouple

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Fenwal 35-705506-011G Ignition Module Freon What causes the capillary toThe Fenwal 35 705506 011G Ignition Module is a professional grade 120V direct spark ignition (DSI) control engineered for high performance gas fired heating systems, industrial burners, and commercial HVAC equipment. As a microprocessor based ignition control, this unit offers superior precision in timing sequences compared to legacy analog models. This specific module is the direct replacement for Fenwal 35 705506 011, providing a seamless retrofit