Honeywell Combined control and ignition system (CVI) S4565AF1007V01B

The Honeywell S4565AF1007V01B is a combined control and ignition system (CVI) for gas boilers, heaters, and water heaters with automatic ignition. It operates at 220–240 V and uses ionization flame detection. The system supports both DBI (direct burner ignition) and IP (intermittent pilot) ignition systems, and includes integrated protection functions. It is designed for use with gas regulators from the VK41 series and meets EN 60730 safety standards. The unit features a connector on top for simplified installation and has a reset wait time of 15 seconds. It is compatible with Dakon DUA 24CK boilers.

Parts of this type are selected by matching the supply voltage, flame detection method, and ignition system type (DBI or IP) to the boiler's requirements. The control box must be compatible with the gas valve series and the boiler's electrical connector. Installation involves connecting the unit to the gas regulator and ensuring proper flame sensor placement. The connector on top allows for straightforward mounting, and the unit can be oriented within 90 degrees of vertical.

When these control boxes fail, the boiler may not ignite or may shut down unexpectedly. Common issues include failure to detect flame, leading to lockout, or intermittent operation due to faulty connections. Check the flame sensor, wiring, and reset button functionality. If the unit locks out, wait at least 15 seconds before resetting.