Honeywell Control board SM11449

The Honeywell SM11449 is an electronic control board (PCB) designed for use in wall-hung boilers. It manages the ignition sequence, including pre-purge, ignition, fuel admission, and flame proving, while enforcing safety times. The board reads inputs from pressure switches and the flame detection sensor, and drives the ignition transformer, gas valve, fan, and other actuators. It is compatible with Baxi LUNA 1.310 Fi Mv and Baxi Luna 1.310 Fi MV boilers. The manufacturer code SM11449 is the reference to verify against the original part.

Control boards of this type are selected by matching the exact series and type designation, supply voltage, safety and pre-purge times, and flame detection method (ionisation, UV, or IR) to the specific boiler model. The board must have the same connector pattern and mounting dimensions as the original. Before ordering, verify the manufacturer code and catalogue article against the original part. Ensure the boiler is electrically isolated before replacement. No generic substitute should be used without cross-referencing the exact Honeywell code.

When a control board of this type fails, the boiler may not ignite, may shut down unexpectedly, or may lock out with an error code. The ignition sequence may be interrupted, or the flame may not be detected. Check the board for visible damage, burnt components, or loose connections. Verify that the board receives correct supply voltage and that all sensors and actuators are functioning properly.