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Error code on LED indicator and running status
■ Characters displayed by the LED indicator are explained in the following table.
Character
Content
Character
0/O
1
Character
Content
Character
C
D
■ Codes representing normal operation statuses are explained in the following table.
Code
Status
NULL: standby
REST: reset
■ Error code display on LED indicator
Code
Symptoms
XX slave communication
ECXX
failure
ER16
ER17
ER18
Overload of pump
ER19
Lack of water flow
ER20
High pressure of #1
ER21
Low pressure of #1
ER22
ER23
ER24
High pressure of #1
ER25
Reserved
Overload of water
ER26
system heater
Ambient temperature too
ER27
high/low
ER28
Reserved
Superheat of #1 is too
ER29
low
Content
Character
Content
2
4
3
5
Content
Character
Content
E
H
F
L
Code
Code
ER30
Reserved
Communication failure
ER31
with master unit
Suction temperature #1
ER32
is too high
Discharge temperature
ER33
#1 is too high
Suction temperature #2
ER34
is too high
Discharge temperature
ER35
#2 is too high
ER36
Low pressure of #2
ER37
ER38
#1
Refrigerant leakage in
ER39
#2
TH1 temperature sensor
ER40
malfunction
TH2 temperature sensor
ER41
malfunction
TH3 temperature sensor
ER42
malfunction
TH4 temperature sensor
ER43
malfunction
TH5 temperature sensor
ER44
malfunction
Character
Content
Character
6
7
Character
Content
Character
N
P
Status
HOP: hot water OFF
DEF: defrosting
Symptoms
ER45
ER46
ER47
ER48
ER49
ER50
ER51
ER52
ER53
ER54
ER55
ER56
ER57
ER58
ER60
Content
Character
8
9
Content
Character
R
T
Code
Status
HOT: hot water ON
Code
Symptoms
malfunction
malfunction
malfunction
malfunction of #1
malfunction
EWT/LWT too high
Anti-freezing protection
No system can start up
Content
A
B
Content
U
Y
47
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