Hitachi YUTAKI RWM-2R1E Installation & Operation Manual page 329

TROUBLESHOOTING
Retry
Alarm YUTAKI 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
315 PMML0575 rev.2 - 03/2022
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
(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
No H-link communication for a
continuous period of 1 minute
between Indoor and LCD User
control by connection wiring
(breaking, wiring error, etc.)