N O T E
NOTE 1.
Cause of stoppage
00 Operation OFF, Power supply OFF
01 Thermo-OFF (NOTE 2), float switch activation
02 Alarm (NOTE 3)
03 Freezing protection, overheat protection
05 Instantaneous power supply failure in the outdoor unit, reset (NOTE 4)
06 Instantaneous power supply failure in the indoor unit, restart (NOTE 5)
07
Stoppage of the cooling operation due to low outdoor air temperature, stoppage of the heating operation due to high outdoor
air temperature
09 Reversing valve changeover stoppage
10 Demand enforced stoppage
11 Retry due to a decrease of pressure ratio
12 Retry due to an increase of low pressure
13 Retry due to an increase of high pressure
14 Retry due to abnormal current in the constant speed compressor
15 Retry due to abnormal high discharge gas temperature, suction pressure excessively low
16 Retry due to a decrease of discharge gas superheat
17 Retry due to Inverter abnormality
18 Retry due to a decrease in voltage, another retry due to the Inverter
19 Expansion valve opening change protection
21 Thermo-OFF due to oil return control
22 Hot start of the outdoor unit
26 Retry due to a decrease of high pressure
28 Cold draft control
30 Thermo-OFF due to compressor forced stop
32 Retry due to a excessive outdoor unit number
NOTE 2. Explanation of the term:
• Thermo-ON
: condition by which an indoor unit is requesting the compressor to operate.
• Thermo-OFF: condition by which an indoor unit is not requesting the compressor operate.
NOTE 3. Even if stoppage is caused by "Alarm", "02" is not always displayed.
NOTE 4. If the transmission between the Inverter printed circuit board and the control printed circuit board is not
carried out for 30 seconds, the outdoor unit stops. In this case, the cause of the stoppage is d1-05 and the alarm
code "04" may be indicated.
NOTE 5. If the transmission between the indoor unit and the outdoor unit is not carried out for 3 minutes, the indoor
units stop. In this case, the cause of stoppage is d1-06 and the alarm code "03" may be displayed.
8 Troubleshooting
241
SMGB0065 rev. 1 - 12/2010
8
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