Brahma Combustion control unit 18048620

The Brahma 18048620 OR3/B combustion control unit is a microprocessor-based device for automatic control of ignition, combustion, and shutdown in gas or oil burners. It supports flame detection via ionization or photoresistor sensors, with mode selection by jumper. The unit provides pre-purge, false flame check, ignition monitoring, and safety lockout, complying with EN 298 and EN 230. It features LED status indication and remote reset terminals, operating from -20 °C to +60 °C.

When selecting a replacement control box of this type, verify the exact series and type designation, supply voltage, safety and pre-purge times, and flame detection method (ionisation, UV, or IR). The physical base or plug pattern must match existing wiring. Burner controls are not interchangeable across series, even within the same brand; a mismatched safety time is a safety hazard. Always check markings on the original unit before ordering.

Typical failures include lockout due to flame detection issues, such as a faulty ionization electrode or photoresistor, or wiring problems. The equipment may fail to start, shut down during operation, or show a red LED indicating safety lockout. Check the flame sensor, wiring connections, and the control box's internal fuse or relay.