HEM4000 Engine Controller User Manual Page 45 of 46
14
FAULT FINDING
Table 15 – Fault Finding
Fault Symptoms
Possible Solutions
Controller no response with
power
Check starting battery;
Check controller connection wirings;
Check DC fuse;
Engine
shutdown
Check whether the water/cylinder temperature is too high or not;
Check DC fuse;
Controller emergency stop
Check whether emergence stop button is correct or not;
Check whether the connection circuit is open;
Low oil pressure alarm after
successful start
Check the oil pressure sensor and its connection wires.
High water temp. alarm after
successful start
Check the temperature sensor and its connection wires.
Shutdown alarm in running
Check relating switches and connection wires according to the
information on the LCD;
Check auxiliary input ports.
Crank failure
Check fuel circuit and its connections;
Check starting battery;
Check speed sensor and its connections;
Refer to engine manual.
Starter no response
Check starter connections;
Check starting battery.
RS485 abnormal
communication
Check connections;
Check whether COM port settings are correct or not;
Check whether A and B wires of RS485 are reversely connected or
not;
Check whether RS485 conversion module is damaged or not;
Check whether the communication port of PC is damaged or not.
