Hitachi RAS-2-HVNP Service Manual page 286

8. Troubleshooting
  
Cause of indoor unit stoppage (
Indication
00 Operation OFF, Power OFF
01 Thermo-OFF
02 Alarm
03
Freeze protection overheating protection
05
Instantaneous power failure at outdoor unit
06
Instantaneous power failure at indoor unit
Stoppage of heating operation due to high outdoor
07
air temperature
10
Demand thermo OFF
13
Retry for Pd increase prevention
15 Vacuum/discharge gas temperature increase retry
16 Retry due to discharge gas SUPERHEAT decrease
IPM error retry, instantaneous over current of in-
17 verter retry, electronic thermal activation of inverter
retry, abnormal current sensor of inverter retry
Retry due to inverter voltage decrease
18
Retry due to
Inverter Over
Retry due to inverter transmission abnormality
19
Other retry
21 Forced Thermo-OFF
22 Outdoor hot start control
24 Thermo-OFF during energy saving operation mode
26 Retry due to high pressure decrease
28 Cooling air discharge temperature decrease
33 Forced Thermo-OFF
34 Forced Thermo-OFF
Retry due to abnormal operating mode
35
(Reversing valve switching failure)
N O T E
• The cause code for indoor unit stoppage is not always "02" (Alarm) during stoppage by the abnormality.
If the unit is under Thermo-OFF by other cause of stoppage before "02" (Alarm) occurs, the previous cause
code for indoor unit stoppage remains.
• When the transmitting between the inverter PCB and the outdoor unit PCB1 is disconnected for 30 seconds,
the outdoor micro-computer will be reset. Accordingly when the alarm code "04" (Abnormal Transmitting
between Inverter PCB and Outdoor Unit PCB1) occurs, the cause code for indoor unit stoppage may be indi-
cated "05".
• When the transmitting between the indoor unit and the outdoor unit is disconnected for 3 minutes, the indoor
micro-computer will be reset. Accordingly when the alarm code "03" (Abnormal Transmitting between Indoor
Unit and Outdoor Unit) occurs, the cause code for indoor unit stoppage may be indicated "06".
• For twin, triple and quad combination, if the cause code for indoor unit stoppage "21" is indicated, check the
cause of stoppage for other indoor units.
• Cause code for indoor unit stoppage "22" is indicated when it is forced thermo-OFF during compressor pre-
heating for RAS-12HN(P/C) models.
272
SMGB0079 rev.0 - 01/2013
dA
)
Contents
voltage
10 Demand thermo OFF:
Temperature Area in Heating Operation
Thermo-OFF Temperature Area
( C)
o
32
30
29
28
26
26
Restart
Temperature Area
24
23
22
20
5 10
Outdoor Temperature
Forced Stoppage
Temperature Area
17 19 21
23
20 25
15
( C)
o