54
4.2 Error code list
Normal display contents:
1. Under standby and no error and protection situation, the main unit will display the detected water tank
sensor temperature (T5), the slave unit will display the address of this unit.
2. Under the main unit with T5 situa
ti
on, displays T5 temperature; if without T5 or T5 sensor is at fault, the unit
will display error; the slave unit will display the detected water inlet temperature (T1).
In case the unit is running abnormally, failure protec
ti
on code will display on both digital display on
PCB board and wired controller. The indicator on the wired controller will
fla
sh with 5Hz. The display codes
are shown in the following table:
Table 3-4.4: Error code list
No.
Error code
Reason
1
E1
Power phase sequence error.
2
E2
Communication error of host unit and wired controller, main unit and slave unit.
3
E3
Error of water outlet temperature sensor (T1).
4
E4
Error of water temperature sensor in the water tank (only host unit displays) (T5).
5
E5
Error of air heat-exchanger temperature sensor (T3).
6
E6
Error of outdoor ambient temperature sensor (T4)
7
E7
Error of E-heater pipe temperature sensor (T6, reserved).
8
E8
Error of circulating water flow detector (Only host unit displays).
9
E9
Error of suction temperature sensor (Th).
10
Ed
Error of water inlet temperature sensor (T7).
11
EA
Error of discharge temperature sensor (Tp).
12
EE
Error of EEprom
13
P0
System low pressure protection
14
P1
System high pressure protection
15
P2
Compressor current of system is overload
ed
(Protection)
16
P4
Protection against high-temperature discharge
(
Temp≥
115ºC)
17
P7
Host unit is not matched with wired controller, host unit will display P7, and wired controller will display
E2.
18
P8
Water outlet Hi-temperature protection. (≥68º
C, and remains for 2 minutes)
19
C1
Compressor current is less than 2A during operation.
20
db
Anti-freezing function
21
d8
ON/OFF signal is ON close status.
22
Hb
Address conflict error.
If any error occurs 4 times within 2 hours, the unit wi
ll
st
op runn
i
ng. A
t
the
sa
m
e
time,
this wi
ll be cou
nt
ed as once
. Aft
er 1
h
our
, th
e un
it wi
ll au
t
o
m
a
ti
cal
ly start
runn
i
ng aga
i
n.
If
the
st
op frequency reac
h
es 5
times,
the
pro
t
ec
ti
on code
wi
ll be d
i
splayed and
the
un
it
s
h
ould be
repo
w
ered aga
i
n.
MCAC-HTSM-201801 Alliance R410A Direct Heating Type HPWH 50Hz Technical Manual