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Controller Control Box for Riello Fs10 Fs20 Gas Burner. Original made in Germany, custom-made for Riello gas burners, perfect fit for installation port and combustion sequence. 3-second safety ignition time, fast lock-out when flame fails, cut off gas supply immediately to avoid gas leakage risk. Visible fault indicator light, one-button manual reset, convenient for on-site troubleshooting. CE & UKCA certified, meets EU safety requirements for thermal equipment. Proven industrial control solution, suitable for boilers, spray booths, industrial furnaces and multiple working conditions.