Brahma Control box FM11 37010051

The Brahma FM11 control box (SKU 37010051) is an electromechanical control relay for automatic ignition and safe operation of atmospheric gas burners in intermittent mode. It supports flame detection via ionisation, UV, or IR methods. This unit is an OEM equivalent for Sime part numbers 6178830 and 6178834, and fits Sime RX 19, RX 26, RX 37, RX 48, and RX 55 boilers. It performs a full control cycle including pre-purge, ignition, flame monitoring, and emergency shutdown, with a dual safety circuit for gas valve control.

Control boxes of this type are selected by matching the supply voltage, safety and pre-purge times, flame detection method (ionisation, UV, or IR), and the base or plug pattern that mates with the burner wiring. Physical fit and electrical connections vary across series, so verify the existing part number and cross-reference manufacturer codes before ordering. Ensure the flame detection method and wiring base are compatible with the burner.

Typical failures include lockout due to flame detection issues, such as a faulty ionisation probe or UV/IR sensor, or a malfunctioning internal relay. Symptoms may include the burner failing to ignite, shutting down unexpectedly, or not responding to heat demand. Check the flame sensor, wiring connections, and the control box's lockout indicator.