Hitachi YUTAKI Series Installation And Operation Manual page 156

TROUBLESHOOTING
Retry
Alarm YUTAKI
Stop
Code S/SC
Code
61 - (o)
62 - (o)
63 - (o)
70 P70 o
83 P83 o
72 o
73 o
74 P74 o
75 - o
76 - o
77 - o
78 o
79 - o
80 - o
81 o
146 PMML0510 rev.1 - 10/2019
YUTAKI YUTAKI
Origin
S80 M
(o) (o) Indoor
(o) (o) Indoor
(o) (o) Communication
o o Indoor
o o Indoor
- - Indoor
o o Indoor
o o Indoor
o o Indoor
o o Indoor
o o Indoor-LCD
o o Indoor-LCD
o o Indoor -outdoor
Indoor
o o
LCD
o o Indoor
Detail of Abnormality
No Cascade Messages.
Triggered in case unit is configured
to work against cascade control
and:
- No messages have been received
for 180 seconds.
- No messages have been received
from beginning of operation.
In case this alarm appears,
software stops Indoor and Outdoor
operations until communication is
restored.
Central mismatch.
Triggered in case YUTAKI
CASCADE CONTROLLER is
configured and they are received
central messages or central control
is configured and they are received
messages form YUTAKI CASCADE
CONTROLLER.
In case this alarm appears,
software stops Indoor and Outdoor
operations until system is properly
configured
Transmission error between
Central and indoor communication
Hydraulic alarm flow & Water Pump
malfunction
Hydraulic alarm pressure
Thermostat Heater Alarm
Mixing over-temperature limit
protection for Mixed circuit.
Unit over-temperature limit
protection
Freeze Protection by Cold water
inlet, outlet temperature detection
Freeze Protection Stop by indoor
liquid temperature thermistor
Receiver Communication failure
RF Communication failure
Unit Capacity setting Error
LCD H-link RCS transmission error No H-link communication for a
(If no H-LINK RCS has no power)
"Momentary Power interruption" or
"Low voltage detected"
Main Factors
Loose, disconnected, broken or
short-circuited connector
Loose, disconnected, broken or
short-circuited connector
Indoor fuse meltdown, Indoor/
central connection wiring (breaking,
wiring error, etc.)
Water flow is not detected in the
hydraulic cycle or Pump defective
Water pressure is not detected in
the hydraulic cycle
High temperature is detected in
Electric Heater
Circuit 2 supply temperature >
Target temperature + offset
Two > Tmax +5K
No Opentherm/Hlink
communication for a continuous
period of 10 minutes.
There is no communication for 1
hour with on or two RF receives
which are bound to the RF-Bridge.
There is no concordance between
indoor outdoor unit capacity
continuous period of 1 minute
between Indoor and LCD User
control by connection wiring
(breaking, wiring error, etc.)