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Code and description Cause Measure
C05 (blocking error)
Control error
Content EEPROM not correct. Reset the controller.
If the error reappears, contact your supplier.
E01 (blocking error)
Temperature error
The temperature in the tank is above
90ºC.
Tap off water, so the temperature drops
in the water heater.
Reset the controller.
Make sure that there is no scale on the
temperature sensor. If necessary, replace
the sensor.
E03 (lock out error)
Temperature error
Temperature difference, between sensor
1 and sensor 2, is more then 10ºC, for
at least 60 seconds.
Make sure that the sensor wiring is
connected and not damaged. Reset the
controller.
If necessary replace the sensor and/or
wiring if the error reappears.
E05 (lock out error)
Control error
Control was in a blocking error for at
least 20 hours.
Press [RESET] to reset the water heater.
If the error reappears:
Find the cause of the blocking error
(parameter 272).
Remove the blockage and reset the
controller.
If the error reappears, replace the
controller.
F01 (blocking error)
Control error
Live and neutral are connected the
wrong way around.
Make sure that the live and neutral are
connected correctly and rectify if necessary.
Floating zero is present. Install an isolating transformer.
F02 (lock out error)
Fan error
Fan does not run on
correct speed
Damaged or disconnected wiring. Make sure that the wiring between the
fan and the controller is connected and
not damaged.
If necessary, replace the wiring. Reset
the controller when the wiring is
reconnected
Contaminated or blocked fan. Make sure that the motor and/or rotor of
the fan are not dirty or blocked.
If necessary remove the dirt and/or
blockage.
Reset the controller.
Make sure that the rotor of the fan can
rotate freely and reset the controller.
Due to a drop in supply voltage, the fan
will not run at the correct speed.
Make sure that the supply voltage is
correct and reset the controller.
The measured voltage must be 230 V
AC
(-15%, +10%)
Contact you maintenance and service
engineer when the supply voltage is not
correct.
Defective motor and/or rotor. Make sure that the motor and/or rotor
are not defective and reset the controller.
Replace the fan when the motor and/or
rotor are defective and reset the
controller.
74 Installation, Maintenance and Service part
74


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