Daikin D2CND024A4AB - Page 11

7 Error codes
Operation manual
11
D2CND024A1/4AB + D2TND012~024A4AB
Wall-mounted condensing boiler
3P469438-3M – 2019.11
# Problem Solution
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.
8H-64 Flow temperature
steep rise
Make sure radiator valves are open
enough to circulate water. Your
boiler will operate again after a while.
If problem repeats, contact your
service agent.
8H-65 Flow-return
temperature
difference too much
Make sure radiator valves are open
enough to circulate water. If problem
repeats, contact your service agent.
E1-64 Flame detection
before burner
operation
Perform reset. If problem repeats,
contact your service agent.
E1-65 Internal SCOT
system error
Perform reset if needed. If problem
repeats, contact your service agent.
E1-66 Calibration conditions
fault
No reset needed. Wait burner to
restart. If problem repeats, contact
your service agent.
E1-67 Missing calibration Perform reset. If problem repeats,
contact your service agent.
E1-68 Ion base value is
outside the factory
limits or saved
incorrectly
Perform reset. If problem repeats,
contact your service agent.
E1-69 Parameter CRC error Perform reset. If problem repeats,
contact your service agent.
E1-70 Parameter CRC error Perform reset. If problem repeats,
contact your service agent.
E1-71 EK lockout failure Permanent error. Contact your
service agent.
E1-72 SCOT flame amplifier Perform reset if needed. If problem
repeats, contact your service agent.
E1-73 Internal PCB error Perform reset if needed. If problem
repeats, contact your service agent.
H9-01 Outside sensor fault Boiler continues operation but
outside sensor is defective. Contact
your service agent.
HC-01 Domestic hot water
temperature sensor
fault
Boiler continues operation but you
must contact your service agent.
HJ-08 High system pressure Discharge water down to 0.8bar.
(You can bleed the radiators.)
HJ-09 Low system pressure Increase the system pressure to
0.8bar
# Problem Solution
HJ-10 Water pressure
sensor fault
Contact your service agent.
J6-01 Flow temperature
sensor overheating
(Can be a blocking
error or a lockout
error)
▪ 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 needed. If problem
repeats, contact your service
agent.
J6-20 Return temperature
sensor overheating
(Can be a blocking
error or a lockout
error)
Perform reset if needed. If problem
repeats, contact your service agent.
J6-21 Return temperature is
higher than flow
temperature
No reset needed, burner operates
itself after a small amount of time. If
problem repeats, contact your
service agent.
JJ-64 Flue temperature
sensor fault
Perform reset. If problem repeats,
contact your service agent.
U2-01 Supply voltage is
below low limit
Contact your service agent.
U2-01 Supply voltage is
above high limit
Your boiler will continue operation
but you must contact your service
agent.
U4-65 Opentherm room
thermostat
connection is
defective
Your boiler will continue operation
but Opentherm room thermostat is
out of operation. Contact your
service agent.
U4-66 CAN-bus timeout If problem repeats, contact your
service agent.
U4-67 Remote reset
supervision
Switch off - switch on power mains. If
problem repeats, contact your
service agent.
UA-64 Blocking during BCC
update process
Contact your service agent.
UA-65 PCB requires a BCC
update
Contact your service agent.
UA-66 BCC-ID of internal
EEPROM is
inconsistent
Contact your service agent.
UA-67 BCC is missing Contact your service agent.
UA-68 BCC is not
compatible with PCB
(BCC-ID)
Contact your service agent.
UA-69 BCC is not
compatible with PCB
(firmware)
Contact your service agent.
UA-70 BCC update error Contact your service agent.
UH-08 Date and time are not
set
If energy metering function is
interrupted or not started, date and
time must be set to resume. Set the
date and time from t parameters
("3.5.3User settings menu"[49])