Error Code For Decorative Type Indoor - McQuay MDS Series Service Manual

6.2 Error Code for Decorative Type Indoor

Error Code #1
Description
Communication error

Indoor and outdoor communication wire broken
Possible causes

Indoor and outdoor communication wire loose

Indoor and outdoor communication wire A and B reversed

Communication wire too long, should less than 1000m

Outdoor PCB not power on

Indoor and outdoor jumper not correct, still on update status

Last indoor unit terminal resistance of communication wire not short-circuit

Indoor and outdoor PCB program not compatible

Indoor and outdoor PCB abnormal
Error Code #2
Description
Indoor sensor error

Possible causes
Indoor sensor broken or loose
Error Code #3
Description
Indoor pump error
Possible causes

Water level switch broken

Indoor pump broken
Error Code #4
Description
Outdoor sensor error

Possible causes
Outdoor sensor broken or loose
Error Code #5
Description
Outdoor pressure sensor error

High/low pressure sensor broken or loose
Possible causes

Outdoor PCB HS/LS port broken
Service Manual SM-MDS_(ii)
Cool/Heat
BLINKING
Cool/Heat
OFF
Cool/Heat
OFF
Cool/Heat
OFF
Cool/Heat
BLINKING
Sleep/Fan
OFF
Sleep/Fan
OFF
Sleep/Fan
BLINKING
Sleep/Fan
BLINKING
Sleep/Fan
BLINKING
Dry/Timer
OFF
Time/Dry
BLINKING
Time/Dry
OFF
Time/Dry
BLINKING
Time/Dry
ON
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