Service Manual

8. Troubleshooting
255
SMGB0079 rev.0 - 01/2013
8
Indication of micro-computer input/output
12
Micro-computer input/output in
indoor unit
C1 
H2
52H
Y52C2
Y212
Y211
Y52C1
Y20B
Y20A
Heating Thermo-ON
Cooling Thermo-ON
Dark
Alarm
Outdoor fan
Dark
13
Micro-computer input/output in
outdoor unit
C2 -
Indication of unit stoppage cause
14 Cause of stoppage
d1 01
00
Operation OFF, power OFF
N O T E 1
Explanationofterm,
Thermo-ON:Aconditionthatanindoorunitisre-
questingcompressortooperate.
Thermo-OFF:Aconditionthatanindoorunitisnot
requestingcompressortooperate.
N O T E 2
Evenifstoppageiscausedby“Alarm”,“02”isnot
alwaysindicated.
N O T E 3
Iftransmissionbetweentheinverterprintedcircuit
boardandthecontrolprintedcircuitboardisnot
performedduring30seconds,theoutdoorunitis
stopped.
Inthiscase,stoppageisd1-05causeandthealarm
code“04”maybeindicated.
N O T E 4
If transmission between the indoor unit and the
outdoor unit is not performed during 3 minutes,
indoorunitsarestopped.
Inthiscase,stoppageisd1-06causeandthealarm
code“03”maybeindicated.
01
Thermo - OFF (NOTE 1), activating oat switch
02
Alarm (NOTE 2)
03
Freeze protection, overheating protection
05
Instantaneous power failure at outdoor unit, reset (NOTE 3)
06
Instantaneous power failure at indoor unit, reset (NOTE 4)
07
Outdoor temperature at cooling lower than -5ºC, outdoor air
temperature and indoor suction temperature at heating (Overload
condition), outdoor temperature at heating lower than -20ºC.
10
Demand, emergency stoppage (DSW 1-4 ON or forced stop)
11
Retry due to compression ratio decrease
12
Retry due to low pressure increase
13
Retry due to high pressure increase
15
Retry due to abnormal high temperature of discharge gas, excessi-
ve low suction pressure
16
Retry due to decrease of discharge gas superheat
17
Retry due to inverter tripping (Instantaneous overcurrent,
electronic thermal acivation, current sensor abnormality)
18
Retry due to inverter tripping (Inverter undervoltage, overvoltage,
transmission error, microcomputer reset, etc.)
19
Expansion valve opening change protection
21
Thermo OFF due to oil return control
22
Oudoor unit hot start control