4 Installation
Installation manual
24
D2C18ND0 D2HND012/18A5AA
Wall-mounted condensing boiler
3P469346-9J – 2018.05
Troubleshooting
LED indication
2 status LED’s are available and positioned next to the LAN
connector.
Status
Green LED
Yellow LED
Normal operation
Pulse every 2
seconds
-
LAN communication
-
Lights up when
communication is
active
Adapter error
Fast blinking
Fast blinking
Upgrade busy
Slow blinking
Slow blinking
Router
In case of connection problems, the router can give information
about the devices connected and the corresponding IP addresses.
Also check on the router if DHCP is enabled.
Error codes
Following errors displayed on the app are hampering the proper
operation of the adapter.
Error Code
Description
U4-65
Connection with the boiler or the connection
between boiler and Remote Control is lost.
H9-01
Connection with the outdoor sensor is lost.
4.9
To fill the system with water
CAUTION
Water filling must be done while the boiler is in standby
mode.
Method 1
(For models D2HND012A5AA and D2HND018A5AA)
a
1
2
4
5
3
C
D
A
a
Use a disconnector or a double check valve according to
local regulations.
After all system connections are performed with care, perform the
following steps:
1
Connect the appliance to the main power supply. Due to low
pressure, error code "Err HJ-09" will appear on the user
interface and the status indicator light will be red.
2
Open
all radiator valves
.
3
Set
all isolating valves
to closed position.
4
Connect fresh water supply pipe to
valve 3
.
5
Open
valves 1, 2, 3, 4
.
6
Slowly turn the
valve 5
to open position until pressure reaches
a value around 0.8 bar for system heights up to 6 metres. For
longer system heights, see
to determine filling pressure. Filling
operation should be done slowly. When pressure exceeds
0.8 bar, error code will disappear and the status indicator light
will turn to blue. Turn the
valve 5
off.
7
Turn the
valve
3
off. Remove the filling loop if it is required by
local regulations.
8
Check the central heating circuit - especially the couplings of
the circuit - for leakage.
9
Make sure the automatic air vent valves located on the pump
and heat exchanger are opened. Vent the air from the
installation with the manual air vent screws on the radiators.
Make sure screws are tightened after venting.
10
If after the venting the pressure decreases below 0.8 bar, refill
with water until the pressure reaches 0.8 bar again.
11
Isolate the appliance from power mains.
Method 2
(For model D2C18ND024A5AA)
E
1
2
4
3
6
5
D
F
B
7
a
8
A
a
Use a disconnector or a double check valve according to
local regulations.
After all system connections are performed with care, perform the
following steps:
1
Connect the appliance to the main power supply. Due to low
pressure, error code "Err HJ-09" will appear on the user
interface and the status indicator light will be red.
2
Open all
radiator valves
.
3
Set all
isolating valves
to closed position.
4
Connect the filling loop to the
valve 7 and valve 8
.
5
Set
valves 1, 3, 5, 6 and 8
to open position.
6
Slowly open the
valve 7
until pressure reaches a value around
0.8 bar for system heights up to 6 metres. For longer system
heights, see
"4.5 Central heating system requirements" on
to determine filling pressure. Filling operation should
be done slowly. When pressure exceeds 0.8 bar, error code will
disappear and the status indicator light will turn to blue. Turn
the
valve 7
off.
7
You can monitor the system pressure value from the user
interface.
8
Make sure the automatic air vent valves located on the pump
and heat exchanger are opened. Vent the air from the
installation with the manual air vent screws on the radiators.
Make sure screws are tightened after venting.
9
If after the venting the pressure decreases below 0.8 bar, refill
with water until the pressure reaches 0.8 bar again.
10
Set
valve 8
to off position. Remove the filling loop if it is
required by local regulations.
11
Check the central heating circuit - especially the couplings of
the circuit - for leakage.
12
Isolate the boiler from power mains.
