Alarms for YUTAKI CASCADE CONTROLLER
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 configuration 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
tempe 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 configuration
209
-
Cascade
Controller
Sub DHW configured on unexisting module
Wrong configuration of the YCC
controller. There is at least one Sub
unit configured 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 specific module.
Sub unit alarm
TROUBLESHOOTING
PMML0575 rev.1 - 09/2021
156