Hitachi YUTAKI S80 Series Technical Catalogue page 154

13. Troubleshooting
LCD dis- 7 segment
Origin
play display
57 57 Outdoor
59 59 Outdoor
Comuni-
63 63
cation
EE-
EE Outdoor
( )
100
70 70 1st cycle Hydraulic alarm
73 73 1st cycle
74 74 1st cycle Unit over-temperature limit protection
75 75
Hydraulic
76 76
Hydraulic
77 77
1st cycle Opentherm communication failure
78 78
1st cycle RF communication failure
1st cycle
79 79
- outdoor
1st cycle
80 80
- LCD
101 02↔H1 2nd cycle Activation of high pressure switch
102 02↔h1 2nd cycle
103 02↔L1 2nd cycle
104 02↔ 1 2nd cycle Activation of low pressure control

105 02↔E1 2nd cycle Excessively low pressure difference
106 02↔61 2nd cycle Excessively high discharge gas temperature
124 21 2nd cycle
125 22 2nd cycle Failure of ambient temperature thermistor
126 23 2nd cycle
127 24 2nd cycle
128 26 2nd cycle
129 27 2nd cycle Failure of discharge gas pressure sensor
130 28 2nd cycle Failure of suction gas pressure sensor
132 04 2nd cycle
134 05 2nd cycle Abnormality of Power Supply Phase
154
TCGB0075 rev.0 - 11/2012
Detail of abnormality
Abnormality of fan motor protection (DC fan
motor)
Inverter fin temperature thermistor abnor-
mality
Transmission error between central and
indoor communication
Compressor factor alarm
Mixing over-temperature limit protection for
mixed circuit
Freeze protection by cold water inlet tempe-
rature detection
Freeze protection stop by indoor liquid tem-
perature thermistor
Unit capacity setting error
LCD H-link transmission error
Activation of protection control for excessi-
vely high pressure
Activation of protection control for excessi-
vely low pressure
Failure of refrigerant evaporation temperatu-
re thermistor
Failure of discharge gas temperature ther-
mistor
Failure of refrigerant liquid temperature
thermistor
Failure of suction gas temperature thermis-
tor
Abnormal transmission between Inverter
PCB and Main PCB
Main factors
Loose, disconnected, broken or short-circuited
connector
Indoor fuse meltdown, indoor/central connec-
tion wiring (breaking, wiring error, etc.)
Alarm to notify damage to compressor occurs 3
times within 6 hours
Water pressure or water flow is not detected in
the hydraulic cycle
Circuit 2 supply temperature > Target tempera-
ture + offset
Water supply temperature (Two) is 5ºC more
than maximum water circuit temperature for 20
sec.
The inlet water temperature is lower than 2 ºC.
No Opentherm communication for a continuous
period of 1 minute
There is no communication for 1 hour with one
or two RF receivers which are bound to the
RF-Bridge.
There is no concordance between indoor out-
door unit capacity
No H-LINK communication for a continuous
period of 1 minute between Indoor and LCD
User control by connection wiring (breaking,
wiring error, etc.)
The high pressure (Pd) is higher than 3.0 MPa.
The high pressure (Pd) is higher than 2.78
MPa during 10 seconds.
The suction pressure (Ps) is lower than 0.15
MPa during 1.5 minutes.
The suction pressure (Ps) is lower than 0.1
MPa during 3 seconds.
The pressure ratio calculated from high pressu-
re (Pd) and low pressure (Ps) is lower than 1.8
MPa during 3 minutes.
The discharge gas temperature is increased to
120 ºC during 10 minutes or is higher than 140
ºC at least 5 seconds.
The refrigerant evaporation temperature ther-
mistor is short-circuited or cut.
The ambient temperature thermistor is short-
circuited or cut.
The discharge gas temperature thermistor is
short-circuited or cut.
The refrigerant liquid temperature thermistor is
short-circuited or cut.
The suction gas temperature thermistor is
short-circuited or cut.
The high pressure sensor is short-circuited or
cut.
The low pressure sensor is short-circuited or
cut.
The communication between Main PCB
(PCB1) and Inverter (DIP - IPM/ISPM) is not
performed correctly during 30 seconds.
The power source phases are reversely con-
nected or one phase is not connected.