Honeywell Gas boiler control unit S4565C3116B

This is a gas boiler control unit from Honeywell, catalog number S4565C3116B, belonging to the category of control boxes. It operates on a supply voltage of 220–240 V and is designed for gas-fired equipment with either direct burner ignition (dbi) or pilot burner ignition (ip). The unit conforms to EN 298 and EN 60730-1 and features a manual reset lockout. It performs a test period (tp) before pre-purge and supports flame detection via a flame sensor rod. It is compatible with VK41 series gas regulators and includes a connector on top for simplified wiring. The reset wait time between attempts is 15 seconds, and reset can be done by button or power interruption.

When selecting a replacement control box of this type, check the supply voltage and ignition system type (direct spark or pilot burner). Variants with suffix C include an auxiliary fan, so confirm that the replacement matches the required fan support. The unit mounts onto the gas regulator via a connector on the top and can be oriented within 90° in any direction from the vertical. Ensure the wiring to the gas valve, ignition transformer, and flame sensor matches the original layout.