Honeywell Control box S4565C1108U

The Honeywell S4565C1108U is a control box for gas burners, designed to work with Honeywell VK41 gas regulators. It operates at 220–240 V and uses ionization flame detection. This model supports an auxiliary fan, airflow control relay, and extended ignition time. It does not directly interact with the flame. It is suitable for gas fuel and supports an external LPG valve.

Control boxes of this type are selected based on supply voltage, flame detection method, and compatibility with the gas valve. They are typically mounted on the gas regulator within a 90-degree angle from vertical. Ensure the connector matches the regulator and that the pre-purge time and restart behavior align with the system requirements.

When these control boxes fail, the burner may not ignite or may lock out after a failed ignition attempt. If the flame is lost during operation, the unit may repeat the starting sequence with pre-purge. Check for proper airflow detection and that the flame sensor is clean and correctly positioned.