Alarm
Code
Retry
Stop
Code
YUTAKI
S
YUTAKI
S COMBI
Origin Detail of Abnormality Main Factors
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 congure “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."
? NOTE
This alarm is shown in the outdoor unit
with alarm code “EE”.
TROUBLESHOOTING
PMML0575 rev.2 - 03/2022
320
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