Honeywell Combined control and ignition system S4565BF1161B

The Honeywell S4565BF1161B is a combined control and ignition system (CVI) designed for use in gas boilers for home central heating, combined boilers, and heaters or water heaters with automatic ignition. It works with gas regulators from the VK41 series, such as the VK4100, to provide safe ignition and flame control of the main burner. This model features pilot burner ignition (IP) and includes a timer for safe ignition time. It operates on a supply voltage of 220–240 V and is an OEM equivalent to the De Dietrich 85025578 control unit, used in De Dietrich DTG 220 Econox/II and DTG 230 Econox boilers.

Parts of this type are selected by matching the supply voltage, ignition system type (pilot or direct spark), and compatibility with the specific gas valve series. The control box must be compatible with the gas regulator model and its electrical connector. Installation involves mounting the control box onto the gas regulator, ensuring proper alignment within a 90-degree angle from vertical, and connecting the electrical wiring according to the manufacturer's diagram. Before ordering, verify the model number and OEM equivalents to ensure a correct match.

When items of this kind fail, the burner may not ignite or may shut down unexpectedly during operation. The equipment might display a lockout condition, requiring a manual reset by pressing the reset button. If the first reset fails, wait at least 15 seconds before attempting again. Common checks include verifying the supply voltage, inspecting the flame sensor and ignition electrode, and ensuring the gas valve is functioning correctly.