Error Code Reference Guide | ECS Systems Troubleshooting

Error Codes

Codes are shown on the HMI and repeated in the controller event log. The log is the more useful of the two, because it keeps the order in which events arrived. When several codes appear together, work on the earliest one: the rest are usually consequences.

Code reference

Code	Meaning	First action
E001	Power supply fault	Check incoming voltage, fuses and the control supply MCB.
E002	Communication timeout	Check the network cable, link lights and the address of the device that stopped responding.
E003	Over temperature	Check cooling fans, filters and room ambient temperature. Reduce load if the room is above rating.
E004	Emergency stop active	Confirm every E-Stop is released, then reset and acknowledge the alarm.
E005	Protection trip	Do not reset until the cause is identified. Read the relay fault record first.
E006	Configuration mismatch	A device was replaced or reflashed. Compare the loaded configuration against the project record.

Before you reset

A trip is a protective action, not a nuisance. Resetting without finding the cause can re-energise a fault into a damaged circuit. E005 in particular should never be reset until the relay record has been read and the reason understood.

If the code is not listed

Record the exact code, the time, and the state of the plant when it appeared, then export the controller event log. Send those to ECS support through the contact page. The code set varies by controller family, so the log is what makes a remote diagnosis possible.