Outdoor Unit Clearing; Failures With Error Code - Fujitsu Waterstage WS G140DC6 Series Maintenance Document

Split system (Single phase and 3-phase type)
2.2

Outdoor Unit Clearing

This section describes the techniques which can be used to identify the failure.

2.2.1 Failures with Error Code

Clear 1: Serial reverse transfer error
Hydraulic Unit LED: Green 1 flash / Red 1 flash
Outdoor Unit LED: Off
Probable causes:

Misconnection.

External cause.

Main PCB failure.
Check:
1-1. Stop the system and start it again (disconnection time 1min):
Is the error still displayed?
2. Check the connections:
- Check the connection between the hydraulic
unit and the outdoor unit.
- Check the connections between the outdoor
unit main board and the active filter board.
3. Check the power supply voltage:
- Check that an AC 198 – 264 V voltage exists between terminals N and L
on the outdoor unit terminal block.
4. Check the serial signal:
- Check the voltage between terminals 2 and 3 of the outdoor terminal block. The
voltage must fluctuate between AC 70 V and AC 130 V.
- If it doesn't, replace Main PCB.
Maintenance Document 1544-1
YES
OK
OK
NO
1-2. Check for external causes:
- Check the system's overall isolation.
- Check for any equipment generating
electromagnetic waves which interfere with the
communication between the hydraulic unit and the
outdoor unit.
9