Hitachi YUTAKI RWM-2R1E Installation & Operation Manual page 334

TROUBLESHOOTING
Retry
Alarm YUTAKI
Stop
Code S
Code
74 P74 o
76 - o
77 - o
78 o
79 - o
80 - o
81 - o
83 - o
84 - o
85 - o
100 - o
320 PMML0575 rev.2 - 03/2022
YUTAKI
Origin
S COMBI
o Indoor
o Indoor
o Indoor-LCD
o Indoor-LCD
o Indoor -outdoor
Indoor
o
LCD
o Indoor
o Indoor
o Indoor
o Indoor
o Indoor-LCD
Detail of Abnormality
Unit over-temperature limit protection
Freeze Protection Stop by indoor liquid
temperature thermistor
Receiver Communication failure
RF Communication failure
Unit Capacity setting Error
LCD H-link RCS transmission error
(If no H-LINK RCS has no power)
"Momentary Power interruption" or "Low
voltage detected"
Low water pressure
High water pressure
Float Switch Alarm
Compressor protection
Main Factors
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.
There is no concordance between indoor
outdoor unit capacity
No H-link communication for a
continuous period of 1 minute between
Indoor and LCD User control by
connection wiring (breaking, wiring error,
etc.)
Water pressure of the system is below
0.5 bar
Water pressure of the system has
increased above 3.7 bar
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
"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".