Markel 43560001 Control 318820-201 or a failing switch diaphragm

or a failing switch diaphragm

verify the part number against your specific unit’s data plate or service manual

maintenance-friendly alternative to traditional air chambers that eventually waterlog and fail

Common Questions: Is a terminal adapter required for the 3RV2031-4JA10

Direct OEM Alignment: Eliminates the guesswork of aftermarket universal blades

Markel 43560001 Control 318820-201 or a failing switch diaphragmThe Markel 43560001 Control is a heavy duty, factory specified Fan Delay Purge Control designed specifically for the 3480 and RCH Series commercial recessed ceiling heaters. Engineered with an L115 20F thermal switch, this component manages the critical purge cycle by delaying fan deactivation after the heating element cycles off. This thermal management ensures that residual heat is fully dissipated from the element, protecting the internal