Fault Phenomenon: SANY SAP90C paver electric screed heater trips the breaker, cannot heat.

Troubleshooting Process:
– Checked heating element: heating rod insulation resistance is zero.
– Checked connections: junction box water ingress causing short.
– Checked fuse: main fuse blown.
– Checked RCD: residual current device tripped.

Root Cause: The internal insulation of the screed electric heating rod is damaged, causing a short circuit to ground and triggering the ground fault protection.

Required Parts: Replace electric heating rod assembly.