Hitachi YUTAKI RWM-2R1E - Alarms for YUTAKI CASCADE CONTROLLER ATW-YCC-03

ENGLISH
12.2.2 Alarms for YUTAKI CASCADE CONTROLLER ATW-YCC-03
Alarm
Code
Retry
Stop
Code
Origin Detail of Abnormality Main Factors
03 - Communication Lost communication with all Sub YUTAKI Units
Loose, disconnected, broken or short-
circuited connector
15 - Indoor Water Circuit 2 thermistor abnormally (THMwo2)
Loose, disconnected, broken or short-
circuited connector
16 - Indoor Water DHW thermistor abnormally (THMdhwt)
Loose, disconnected, broken or short-
circuited connector
17 - Indoor Auxiliary sensor 2 thermistor abnormally (THMaux2)
Loose, disconnected, broken or short-
circuited connector
18 - Indoor Auxiliary sensor 1 thermistor abnormally (THMaux1)
Loose, disconnected, broken or short-
circuited connector
25 - Indoor Auxiliary sensor 3 thermistor abnormally (THMaux3)
Loose, disconnected, broken or short-
circuited connector
40 - Indoor Incorrect LCD setting
Current LCD conguration does not
allow proper operation
60 - Sub unit
All Sub units are in alarm state or there is no communication.
Alarm release, when issue disappears
Sub unit alarm
73 Indoor Mixing over-temperature limit protection for Mixed circuit.
Circuit 2 supply temperature > Target
temperature + offset
74 P74 Indoor Unit over-temperature limit protection Two > Tmax +5K
75 - Indoor
Freeze Protection by Cold water inlet, outlet temperature
detection
77 - Indoor-LCD Receiver Communication failure
No Opentherm/Hlink communication
for a continuous period of 10 minutes.
78 Indoor-LCD RF Communication failure
There is no communication for 1 hour
with on or two RF receives which are
bound to the RF-Bridge.
80 -
Indoor LCD H-link RCS transmission error No H-link communication for a
continuous period of 1 minute between
Indoor and LCD User control by
connection wiring (breaking, wiring
error, etc.)
LCD (If no H-LINK RCS has no power)
208 -
Cascade
Controller
Module with Repeated H-LINK address Wrong slave address conguration
209 -
Cascade
Controller
Sub DHW congured on unexisting module
Wrong conguration of the YCC
controller. There is at least one Sub
unit congured as Sub DHW tank
without any DHW Main unit
21X - Sub unit
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 specic module.
Sub unit alarm
TROUBLESHOOTING
PMML0575 rev.2 - 03/2022
321