The burner ignites and shuts down after a few seconds: where the fault is usually located

When the flame is established normally but the burner shuts down within a few seconds, the problem is often related to flame monitoring, the transition from pilot to main flame, or an interlock that is lost immediately after ignition.

Flame signal check

The flame may be visually present, but the BMS may not be receiving a sufficient signal from the ionization electrode or UV scanner.

Pilot to main flame transition

If the pilot flame is correct but the main flame does not stabilize, check the pressure, the position of the main gas valve, and the air-gas ratio.

Loss of air proving

The air pressure switch may be confirmed at the beginning but loses the signal when the damper changes position.

Gas pressure trip

When the main consumption starts, the pressure may drop below the setpoint of the low gas pressure switch.

Using the log history

The time interval between ignition and trip is significant. If the trip always occurs at the same point in the sequence, the diagnosis becomes much more targeted.