Daikin D2C20ND028A5AA [11/24] Error codes

Daikin D2C20ND028A5AA [11/24] Error codes
7 Error codes
Operation manual
11
D2C20ND028A5AA + D2C24ND035A5AA
Wall-mounted condensing boiler
3P469438-10H – 2018.05
# Problem Solution
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
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.
# Problem Solution
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"on
page8)

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