Alarms For Yutaki Cascade Controller Atw-Ycc-(01/02); Alarms For Outdoor Units - Hitachi YUTAKI RWM-2R1E Installation & Operation Manual

TROUBLESHOOTING

12.1.2 Alarms for YUTAKI CASCADE CONTROLLER ATW-YCC-(01/02)

Retry
Alarm
Stop Origin
Code
Code
03 - Communication
15 - Indoor
16 - Indoor
17 - Indoor
18 - Indoor
25 - Indoor
40 - Indoor
60 - Slave unit
73 Indoor
74 P74 Indoor
75 - Indoor
77 - Indoor-LCD
78 Indoor-LCD
Indoor
80 -
LCD
21X - Slave unit

12.1.3 Alarms for Outdoor units

Code
Category
number
Activation of protection device
2 Outdoor unit
(high pressure cut)
Abnormal transmission between outdoor and
3
indoor units
Transmission
Abnormal transmission between inverter PCB
4
and RASC unit PCB
Reception of abnormal operation code for
5 Power supply
detection of power source phase
Excessively low voltage or excessively high
6 Voltage
voltage for the inverter
317 PMML0575 rev.2 - 03/2022
Detail of Abnormality
Lost communication with all slave YUTAKI Units
Water Circuit 2 thermistor abnormally (THMwo2)
Water DHW thermistor abnormally (THMdhwt)
Auxiliary sensor 2 thermistor abnormally (THMaux2)
Auxiliary sensor 1 thermistor abnormally (THMaux1)
Auxiliary sensor 3 thermistor abnormally (THMaux3)
Incorrect LCD setting
All slave units are in alarm state or there is no communication.
Alarm release, when issue disappears
Mixing over-temperature limit protection for Mixed circuit.
Unit over-temperature limit protection
Freeze Protection by Cold water inlet, outlet temperature detection
Receiver Communication failure
RF Communication failure
LCD H-link RCS transmission error
(If no H-LINK RCS has no power)
Module X is in alarm state. X stands for the module number. A
module is determined to be in alarm state in case that module is in
alarm or YUTAKI CASCADE CONTROLLER lost communication
with specific module.
Type of abnormality
Loose, disconnected, broken or
short-circuited connector
Loose, disconnected, broken or
short-circuited connector
Loose, disconnected, broken or
short-circuited connector
Loose, disconnected, broken or
short-circuited connector
Loose, disconnected, broken or
short-circuited connector
Loose, disconnected, broken or
short-circuited connector
Current LCD configuration does not
allow proper operation
Slave unit alarm
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.
No H-link communication for a
continuous period of 1 minute
between Indoor and LCD User
control by connection wiring
(breaking, wiring error, etc.)
Slave unit alarm
Main cause
Activation of PSH, locked motor, abnormal operation in the power
supply phase.
Failure of fan motor, drain discharge, PCB, relay, float switch
activated.
(Pipe clogging, excessive refrigerant, innert gas mixing, fan motor
locking at cooling operation)
Incorrect wiring. Loose terminals, Failure of PCB. Tripping of fuse.
Power supply OFF.
Transmission failure between inverter PCBs. (Loose Connector,
Wire Breaking, Blowout of Fuse).
Power source with abnormal wave pattern. Main power supply
phase is reversely connected or one phase is not connected.
Voltage drop in power supply. Incorrect wiring or insufficient
capacity of power supply wiring.
Main Factors