ENGLISH
Alarm
Code
Retry
Stop
Code
YUTAKI S
YUTAKI S
COMBI
Origin
Detail of Abnormality
Main Factors
61
-
(o)
(o)
Communication
Triggered in case no YCC messages
have been received for more than
180 seconds since last message was
received.
In case this alarm appears, software
stops Indoor and Outdoor operations
until communication is restored.
YCC stops sending messages to slave
unit since YCC has been powered
OFF or disconnected from the H-Link
Line or H-Link line has been damaged
70
P70
o
o
Indoor
Hydraulic alarm flow & Water Pump
malfunction
Water flow is not detected in the
hydraulic cycle or Pump defective
72
o
o
Indoor
Thermostat Heater Alarm
High temperature is detected in
Electric Heater
73
o
o
Indoor
Mixing over-temperature limit
protection for Mixed circuit.
Circuit 2 supply temperature > Target
tempe offset
74
P74
o
o
Indoor
Unit over-temperature limit protection
Two > Tmax +5K
76
-
o
o
Indoor
Freeze Protection Stop by indoor
liquid temperature thermistor
77
-
o
o
Indoor-LCD
Receiver Communication failure
No Opentherm/Hlink communication
for a continuous period of 10 minutes.
78
o
o
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.
79
-
o
o
Indoor -outdoor
Unit Capacity setting Error
There is no concordance between
indoor outdoor unit capacity
80
-
o
o
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)
81
-
o
o
Indoor
“Momentary Power interruption” or
“Low voltage detected”
83
-
o
o
Indoor
Low water pressure
Water pressure of the system is below
0.5 bar
84
-
o
o
Indoor
High water pressure
Water pressure of the system has
increased above 3.7 bar
85
-
o
o
Indoor
Float Switch Alarm
Float switch detects high level of water
at drain pane. Malfunction of the drain
pump.
It is required to configure “Float
switch” Accessory as input signal
100
-
o
o
Indoor-LCD
Compressor protection
"Compressor failure. This alarm code
appears when the following alarms 02,
07, 08, 45, 47 occur three times within
6 hours."
?
N O T E
This alarm is shown in the outdoor unit
with alarm code “EE”.
TROUBLESHOOTING
PMML0575 rev.1 - 09/2021
155
