Hitachi RAS-(3-6)HVRNM2E Service Manual page 297

8 Troubleshooting
00 Operation OFF, Power OFF
01 Thermo - OFF (Note 1)
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)
Stoppage of Cooling operation due to Low Outdoor Air Temperature (<=-7 ºC), Stoppage of Heating Operation due to high Outdoor Air
07
Temperature, and high indoor air temperature, stoppage of heating operation due to low Outdoor Air Temperature (<=-20 ºC)
10 Demand, enforced stoppage
13 Retry due to high pressure increase
15 Retry due to abnormal high temperature of discharge gas, excessive low suction pressure
16 Retry due to decrease of discharge gas superheat
17 Retry due to inverter tripping
18 Retry due to voltage decrease
19 Expansion valve opening change protection
20 Operation mode change over of indoor unit (Note 5)
21 Enforced thermo-off, when other indoor unit thermo-off
22 Hot start after 4 hours switch on the outdoor unit
24 Cold draft protection 2
N O T E
• Explanation of Terms
- Thermo-ON: A condition where an indoor unit is requesting the compressor to operate.
- Thermo-OFF: A condition where an indoor unit is not requesting the compressor to operate.
• Even if stoppage is caused by "Alarm", "02" is not always displayed.
• If the transmission between the inverter printed circuit board and the control printed circuit board is not per-
formed during 30 seconds, the stoppage cause is d1-05 and the alarm code "04" may be displayed.
• If the transmission between the indoor unit and the outdoor unit is not performed during three minutes, the
Indoor Units are stopped.
In this case, the stoppage cause is d1-06 and the alarm code "03" may be displayed.
• In the system "20" will be indicated at the difference between indoor units.
N O T E
• If a transmission error continues for three minutes, one is added to the occurrence counter.
• The memorized data can be cancelled by the method which is explained in section 8.3.1 "Self-checking Pro-
cedure of PCB by means of the Remote Control Switch".
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SMGB0064 rev.0 - 08/2011
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