7 x Errors and faults
Daikin RoCon
Daikin Control unit
008.1543999_00 – 03/2017 – EN
Operating instructions
57
For further information on possible errors and faults, see appli-
cable documents.
Code Component/Designation Error Possible error rectification
E72 Internal mixer sensor t
V2
Measured value outside measuring range,
temperature sensor defective.
● Check cable, terminal and plug connec-
tions.
● Replace temperature sensor.
E75
External temperature sen-
sor
E76
Storage tank temperature
sensor
E81 EEPROM
Internal error.
● Total reset
● Replace control unit switching panel
PCB.
E88
Control unit switching panel
PCB
E91 Connected CAN modules CAN module bus ID duplicated. ● Configure bus addresses correctly.
E100
(1
Flue gas temperature sen-
sor
Measured value outside measuring range,
sensor/temperature sensor defective.
(1 locking error if the flue gas temperature sensor is ob-
ligatory for this heat generator type (e.g. Daikin A1).
Burner release only takes place if the fault has been
manually unlocked.
● Check cable, terminal and plug connec-
tions.
● Replace sensor/temperature sensor.
E128
Temperature sensor in the
flow sensor
Measured value outside measuring range,
sensor/temperature sensor defective.
● Check cable, terminal and plug connec-
tions.
● Replace sensor/temperature sensor.
E129 Pressure sensor
E198 Flow sensor Volume flow too low.
● Check heating circulation
pump/filter/heating network.
E200 Communication, firing unit
Communication interrupted between firing
unit and control unit switching panel PCB.
● Check cable and plug connections.
● Total reset
● Replace control unit switching panel
PCB.
● Replace the firing unit.
W8001
Flow sensor
Warning message: Measured value less than
recommended minimum flow.
● Check parameter settings (see tab. 6-2).
● Check pipes and valves for blockages.
● Check integrated heating circulation
pump.
E8002
Measured value under permitted minimum
value. Flow sensor/integrated heating circula-
tion pump defective.
W8003
Flue gas temperature
Warning message: The flue gas temperature
has exceeded the limit temperature.
● Clean the boiler.
● Check flue gas temperature sensor.
E8004
Flue temperature has exceeded the permissi-
ble absolute maximum value.
E8005
Water pressure
Measured value under permissible minimum
value.
● Top up heating water.
● Leak test.
W8006
Warning message: Maximum permissible
pressure drop exceeded.
W8007
Warning message: Measured value exceeds
permissible maximum value.
● Check diaphragm expansion vessel.
● Drain heating water.
Tab. 7-3 Error codes (can be detected by the switching panel PCB)
Observe maximum tightening torque of 10 Nm for all
temperature sensors.
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