Hitachi RAS-(4-12)HNP(1)(E) - Cause of Indoor Unit Stoppage

8 Troubleshooting
296
SMGB0087 rev.0 - 12/2013

Cause of indoor unit stoppage (dA)
Indication Contents
N O T E
10 Demand thermo OFF:
32
30
28
26
24
22
20
5
10 15
20
25
(
o
C)
(
o
C)
29
23
23
26
21
19
17
Temperature Area in Heating Operation
Outdoor temperature
Thermo-OFF temperature area
Forced stoppage
temperature area
Air inlet temperature of indoor unit
Restart
temperature area
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
07
Stoppage of Cooling Operation due to Low Outdoor Air
Temperature
Stoppage of Heating Operation due to High Outdoor Air
Temperature
10
Demand
11
Retry due to compression ratio decrease
12
Retry due to low pressure increase
13
Retry for Pd increase prevention
15
Vacuum/discharge gas temperature increase retry
16
Retry due to discharge gas SUPERHEAT decrease
17
IPM error retry, instantaneous over current of inverter
retry, electronic thermal activation of inverter retry, abnor-
mal current sensor of inverter retry
18
Retry due to inverter voltage decrease
Retry due to Inverter Overvoltage
Retry due to inverter transmission abnormality
19
Retry due to Expansion Valve Control
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 (example: due to Air Filter Cleaning)
34
Forced Thermo-OFF (example: due to Motion Sensor
35
Retry due to abnormal operating mode
(Reversing valve switching failure)
39
Forced Thermo-OFF due to Power Saving Control)
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 out-
door 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 indicated “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 Out-
door 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 preheating for
RAS-12HN(P/C) models.