Sinclair SCV-1400EB, Service Manual

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5.8 EC Troubleshooting
Digital display output
Description

EC indicates that the number of slave units detected by master unit has decreased.

All units stop running.
 Error code is only displayed on the user interface.
Possible causes

Some outdoor units power off.

Power supply abnormal.
 Incorrect outdoor unit address setting.

Communication wires between outdoor units not connected properly.

Wiring connection is loosen.

Damaged main PCB or electric control box communication terminals block.
Procedure
EC
Some outdoor units in the system are
powered off 1
Yes
Power on all the outdoor units
No
The power supply is abnormal
Yes
Check the power supply equipment
No
Troubleshoot as for an E2 error
2
Notes:
1. For SCV-750EB and SCV-1400EB, check digital display on the main PCB. If digital display is on, the main PCB is powered on, if digital display is off, the main
PCB is powered off. Please refer to labeled 11 in Part 4, 2.7 Slave PCB component.
2. For SCV-900EB and SCV-1800EB, check digital display on the main PCB. If digital display is on, the main PCB is powered on, if digital display is off, the main
PCB is powered off. Please refer to labeled 37 in Part 4, 2.2.1 Main PCB component.
3. See Part 4, 4.4 “E2 Troubleshooting”.