Hitachi RWM-2R1E Installation & Operation Manual page 166

TROUBLESHOOTING
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Alarms for YUTAKI CASCADE CONTROLLER
Retry
Alarm
Stop Origin
Code
Code
03 - Communication
15 - Indoor
16 - Indoor
17 - Indoor
18 - Indoor
25 - Indoor
40 - Indoor
60 - Sub unit
73 Indoor
74 P74 Indoor
75 - Indoor
77 - Indoor-LCD
78 Indoor-LCD
Indoor
80 -
LCD
Cascade
208 -
Controller
Cascade
209 -
Controller
21X - Sub unit
156 PMML0575 rev.1 - 09/2021
Detail of Abnormality
Lost communication with all Sub 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 Sub 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 with Repeated H-LINK address
Sub DHW configured on unexisting module
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.
Main Factors
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
Sub 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.)
Wrong slave address configuration
Wrong configuration of the YCC
controller. There is at least one Sub
unit configured as Sub DHW tank
without any DHW Main unit
Sub unit alarm