Hitachi RAS-2-HVNP - Page 286

8. Troubleshooting
272
SMGB0079 rev.0 - 01/2013

Cause of indoor unit stoppage (dA)
Indication Contents
00
Operation OFF, Power OFF
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
Thermo-OFF Temperature Area
Temperature Area in Heating Operation
Outdoor Temperature
Restart
Temperature Area
Forced Stoppage
Temperature Area
Air Inlet Temp. of Indoor Unit
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 heating operation due to high outdoor
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
17
IPM error retry, instantaneous over current of in-
verter retry, electronic thermal activation of inverter
retry, abnormal current sensor of inverter retry
18
Retry due to inverter voltage decrease
Retry due to Inverter Overvoltage
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
35
Retry due to abnormal operating mode
(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.