McQuay MDS 240B User Manual

76 Service Manual SM-MDS_(ii)
Communication error
Error Code: Decorative Error code #1, FC, L3 (For MC301), C- to CX (For MDOM PCB), EC00 to EC47, EC78 (For MDS-M
PCB)
Turn off the unit. Check
is the connection of
communication wire loose.
Tighten the wire and restart the
system
NO
YES
Replace indoor/outdoor PCB
Turn on the unit
Check is the communication
wire broken / shorted.
YES
Replace the wire and restart the
system
NO
Check the communication
wire. Is A-B reversed?
YES
Reverse the communication wire
and restart the system
Is communication
wire too long? Should
not exceed 1000m.
Reduce the length of the
communication wire and restart the
system
NO
Is the PCB turned on?
Check the power supply
NO
YES
YES
NO
Is last indoor PCB
jumper JP1 shorted?
Short jumper JP1 and restart the
system
NO
YES
Is the indoor and outdoor
PCB version compatible?
Refer Appendix 7.1
Is the PCB dipswitch
setting correct?
Is the Dipswitch in
update status?
Reset the DIP switch and restart the
system
YES
NO
YES
NO
Upgrade/downgrade the PCB
software version or change PCB
and restart the system
6

McQuay MDS 240B Specifications

General

Brand	McQuay
Model	MDS 240B
Category	Compressor
Language	English