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2.1.1 Alarm codes description
NOTE
• (o): Option configurable from Unit controller. This alarm will be displayed if the system has been configured.
• o: Default. This alarm will be displayed in the Unit controller.
• –: No applicable.
Retry
Alarm
YUTAKI
YUTAKI
YUTAKI
Stop
Code
S/SC
S80
M
Code
o
o
o
Communication Transmission Alarm (Not outdoor unit detected)
3
-
o
o
o
11
-
o
o
o
12
-
o
o
o
13
–
o
o
o
14
–
(o)
(o)
(o)
15
-
(o)
(o)
(o)
16
-
(o)
(o)
(o)
17
-
(o)
(o)
(o)
18
-
o
19
-
-
-
o
19
-
-
o
23
-
-
(o)
(o)
(o)
25
-
o
o
o
40
-
(o)
(o)
(o)
61
-
(o)
(o)
(o)
62
-
(o)
(o)
(o)
Communication Transmission error between Central and indoor communication
63
-
P70
o
o
o
70
P83
o
o
o
83
o
72
-
-
o
o
o
73
P74
o
o
o
74
o
o
o
75
-
o
o
o
76
-
o
o
o
77
-
o
o
o
78
PMEN0602 rev.0 - 05/2023
Origin
Indoor
Water inlet thermistor abnormally (THMwi)
Indoor
Water outlet thermistor abnormally (THMwo)
Indoor
Indoor Liquid Pipe Temp Thermistor Abnormality (THMl)
Indoor
Indoor Gas Pipe Temperature Thermistor Abnormality (THMg)
Indoor
Water Circuit 2 thermistor abnormally (THMwo2)
Indoor
Water DHW thermistor abnormally (THMdhwt)
Indoor
Auxiliary sensor 2 thermistor abnormally (THMaux2)
Indoor
Auxiliary sensor 1 thermistor abnormally (THMaux1)
Indoor
Water Plate HEX pipe thermistor abnormally (THMwohp)
Indoor
Suction R134a pipe thermistor abnormally (THMs)
Indoor
Discharge R134a pipe thermistor abnormally (THMd)
Indoor
Auxiliary sensor 3 thermistor abnormally (THMaux3)
Indoor
Incorrect LCD setting
No Cascade Messages.
Triggered in case unit is configured to work against cascade control and:
Indoor
- 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
Indoor
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
Indoor
Hydraulic alarm flow & Water Pump malfunction
Indoor
Hydraulic alarm pressure
Indoor
Thermostat Heater Alarm
Indoor
Mixing over-temperature limit protection for Mixed circuit.
Indoor
Unit over-temperature limit protection
Indoor
Freeze Protection by Cold water inlet, outlet temperature detection
Indoor
Freeze Protection Stop by indoor liquid temperature thermistor
Indoor-LCD
Receiver Communication failure
Indoor-LCD
RF Communication failure
Detail of Abnormality
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
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
Loose, disconnected, broken or short-circuited connector
Current LCD configuration does not allow proper operation
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.
2
66
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