Fault Phenomenon: SANY SAP125C paver starting the heater, the burner fails to ignite after several attempts and locks out with an alarm.

Troubleshooting Process:
– Checked spark plug: spark plug position offset or carbonized.
– Checked flame sensor: flame detection probe dirty.
– Checked gas source: unstable LPG pressure.
– Checked air damper: improper air damper opening.

Root Cause: The flame detection probe (flame sensor) surface is covered with carbon deposits, unable to detect the flame, causing the system to determine ignition failure.

Required Parts: Clean flame detection probe and spark plug.