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High-
High pressure
pressure 2
switch 2 cuts
protection
P08
1. The fan is faulty
or stuck.
P11
DC fan fault
2. The main con-
trol board is faulty
High
1. Too low water
temperature
flow
P12
protection of
2. Main PCB
heating
damaged
water outlet
Controller
communi-
cation
E01
failure
TP1 exhaust
sensor tempera-
gas tempe-
ture deviation
rature sensor
or cuts
E02
failure
T3 coil tem-
sensor
perature
temperature
sensor
deviation or cuts
E03
failure
T4 ambient
sensor
temperature
temperature
sensor
deviation or cuts
E04
failure
T5 liquid
gas
temperature
E05
sensor
TH return
sensor
gas
temperature
temperature
deviation or cuts
sensor
E06
failure
TW water
sensor
tank
temperature
temperature
deviation or cuts
E07
sensor failure
sensor
T6 inlet water
temperature
temperature
E08
deviation or cuts
sensor failure
T7 outlet wa-
sensor
ter tempera-
temperature
ture sensor
deviation or cuts
E09
failure
Check if high pressure
switch 2 cuts under
unit OFF condition
1. Check whether the
fan is stuck, or replace
with a new fan.
2. Replace the main
control board
1. Check if water in valve
is closed or no water in;
2. Check if flow switch is
blocked or damaged;
3. Check if "Y" Shape
filter blocked.
Communica
Check
tion cable
communication
cuts
cable if cut
Check sensor
resistance value or if
sensor cuts
Check sensor
resistance value or if
sensor cuts
Check sensor
resistance value or if
sensor cuts
Check sensor
sensor
temperature
resistance value or if
sensor cuts
deviation or cuts
Check sensor
resistance value or if
sensor cuts
Check sensor
resistance value or if
sensor cuts
Check sensor
resistance value or if
sensor cuts
Check sensor
resistance value or if
sensor cuts
Change high pressure
switch 2
1. Check if the fan is
stuck, or replace with a
new fan.
2. Replace the main
control board.
1. Check the water filter
and water circuit (no
block)
2. Replace the PCB
Change connection
cable or re-connect
Change sensor or re-
connect cable
Change sensor or re-
connect cable
Change sensor or re-
connect cable
Change sensor or re-
connect cable
Change sensor or re-
connect cable
Change sensor or re-
connect cable
Change sensor or re-
connect cable
Change sensor or re-
connect cable
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V.1
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