Honeywell Gas boiler control unit S4564BF1014U

The Honeywell S4564BF1014U is a gas boiler control unit designed for periodic ignition systems of pilot burners. It operates on a supply voltage of 230–240 V and is compatible with gas valves of the VR4600 series. The unit supports both DBI and IP ignition applications and features an electromagnetic filter. It connects via a Molex 3001 multi-edge connector and has a service life of 250,000 cycles under maximum load, with 500,000 safety valve operator cycles, 6,000 blocking operations, and 1,000 hours of sparking. Reset and alarm modes can be integral or remote.

When selecting a control unit of this type, ensure the supply voltage matches the system (e.g., 230–240 V) and that the gas valve series is compatible (e.g., VR4600). The connection type must correspond to the existing wiring, such as a Molex 3001 multi-edge connector. Verify the application type (DBI or IP) and the required reset/alarm configuration (integral or remote). Installation orientation can vary within ±90° from vertical, and the unit should be mounted to allow proper electrical connections.

Typical failures of such control units include failure to ignite, intermittent operation, or complete shutdown. Symptoms may include the alarm indicator lighting up, the gas valve not opening, or no spark generation. Check the supply voltage, connections, and the condition of the flame detection rod. If the unit has exceeded its rated cycles (e.g., 250,000 under maximum load), it may need replacement.