4 Maintenance and cleaning
Operation manual
10
D2C20ND0 D2C24ND035A5AA
Wall-mounted condensing boiler
3P469438-10H – 2018.05
4
Maintenance and cleaning
WARNING
The boiler should be maintained by authorised persons
every year.
Annual maintenance cycle is very important for safe operation of
your boiler and to ensure reliable, efficient and long lasting operation
of it.
Contact your service agent for details.
DANGER
Incorrect maintenance and repairs can lead to injury and
material damage.
▪ Never attempt to perform maintenance work or repairs
on the unit yourself.
▪ Contact your service agent.
4.1
To clean the outer surface of the
unit
Clean the outer surface of your boiler with a damp cloth and a little
solvent-free soap.
CAUTION
Sprays, solvents or cleaning agents containing chlorine
can damage the exterior, the fittings or the control unit. Do
not use them for cleaning purposes.
5
Energy saving tips
▪ Operating the unit in central heating ECO mode provides the most
economical central heating operation conditions.
▪ Do not run the boiler in domestic hot water comfort mode.
Domestic hot water comfort mode involves pre- and post-heating,
which is luxury, not necessity.
▪ Close the thermostatic radiator valves when ventilating the rooms.
▪ The largest heat loss occurs through windows and outer doors.
Check windows and doors for air-tightness. Close any blinds at
night.
▪ Do not hide radiators behind large furniture (i.e. couch, desk, etc.).
Minimum 50 cm of clearance must remain, otherwise the heated
air cannot be circulated and the room will not heat up efficiently.
▪ Do not let your room become too hot. Decreasing the room
temperature during the day saves energy.
▪ Have your combi boiler's maintenance performed at least
annually.
▪ Provide your building with sufficient heat insulation.
▪ Thermostatic valves should be used. Each room should be
adjusted according to comfort conditions. For reception rooms,
this is 20°C, living rooms 22°C, kitchens 18°C and bedrooms
18°C.
▪ Prevent radiators from getting covered by curtains.
6
Contact
Contact a local competent service agent if you have any questions
regarding the maintenance and repair of your system. You can find
the contact information of our competent services at www.daikin.com
7
Error codes
#
Problem
Solution
10-64
Gas valve circuit error Perform reset. If problem repeats,
contact your service agent.
10-65
Gas valve current
error
Perform reset. If problem repeats,
contact your service agent.
11-64
Ignition does not take
place
Make sure valve on the gas line is
opened. Perform reset after third
unsuccessful ignition trial.
11-65
Flame stabilisation
fault
Wait for boiler's ignition trial.
11-66
Flame signal loss in
safety time
Perform reset after third
unsuccessful ignition trial. If problem
repeats, contact your service agent.
11-67
Flame loss during
operation
Temporary error. Wait for boiler to
re-ignite.
12-64
Ion control deviation
is too big
Perform reset if needed. If problem
repeats, contact your service agent.
12-65
Ignition SCOT
actuators fault does
not take place
Perform reset if needed. If problem
repeats, contact your service agent.
12-66
Ion base value
exceeds lower factory
limit
Perform reset. If problem repeats,
contact your service agent.
12-67
Ion base value
exceeds upper
factory limit
Perform reset. If problem repeats,
contact your service agent.
12-68
Ion base value differs
excessively from
previous value
Perform reset if needed. If problem
repeats, contact your service agent.
12-69
Offset adaption at
limit
Boiler continues operation but
contact your service agent.
12-70
Offset adaption not
executable
Boiler continues operation but
contact your service agent.
13-64
Fan speed error
Perform reset if needed. If problem
repeats, contact your service agent.
13-65
Fan speed error
Perform reset. If problem repeats,
contact your service agent.
16-64
Flue temperature
signalise overheating
Check flue gas discharge path.
Perform reset if needed. If problem
repeats, contact your service agent.
1J-64
High limit thermostat
signalise overheating
▪ Check the valves of the radiators
in the heating circuit.
▪ Check the combi boiler water
pressure. If it is low, fill the heating
circuit with water.
▪ Perform reset. If problem repeats,
contact your service agent.
80-01
Return temperature
sensor fault
Perform reset. If problem repeats,
contact your service agent.
81-01
Flow temperature
sensor fault
Perform reset. If problem repeats,
contact your service agent.
81-65
Domestic hot water
solar temperature
sensor fault
Boiler continues operation but solar
sensor is defective. Contact your
service agent.
8A-46
Freeze protection
Unit does not operate if flow
temperature sensor reads value less
than 1°C. Wait until the error code is
removed from the screen.
