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12.1.2
n
Code and description
C02 (lock out error)
Control error
Error message from the
controller
C03 (blocking error)
Control error
C04 (blocking error)
Control error
C05 (blocking error)
Control error
E01 (blocking error)
Temperature error
E03 (lock out error)
Temperature error
E05 (lock out error)
Control error
74
Displayed errors
Note
For the coding of the connections, refer to the Electrical wiring diagram (see section
13.4).
Note
Contact your service and maintenance engineer if the error persists.
Cause
•
Incorrect reference voltage from the
AD converter.
•
EEPROM read error.
•
50 Hz error.
•
Internal communication error.
•
Gas control valve relay error.
•
Safety relay error.
•
Ignition relay error.
•
RAM error.
•
EEPROM error.
•
EEPROM content does not match the
software version.
•
Processor software error.
•
Ionisation circuit error
More then 7 resets detected in a short
period.
This error appears when the controller
and/or display is replaced.
Incorrect selection of the water heater.
Content EEPROM not correct.
The temperature in the tank is above
90ºC.
Temperature difference, between sensor
1 and sensor 2, is more then 10ºC, for
at least 60 seconds.
Control was in a blocking error for at
least 20 hours.
Measure
•
Make sure that the wiring/flame probe
are not damaged. If necessary, replace
the wiring/flame probe.
•
Make sure that the flame probe is not
bend. If necessary, replace the flame
probe.
•
Reset the controller.
•
If the error reappears, make sure that
the frequency of the power supply is 50
Hz (-1, +1 Hz).
•
If the frequency is not correct, contact
your service and maintenance engineer.
•
If the frequency is correct and the error
reapers, replace the controller.
•
Make sure that there is no "floating zero".
If necessary, install an isolating
transformer.
Wait for the error to disappear (maximal 1
hour).
If the error does not disappear, replace the
controller
Turn the water heater OFF and ON. When
the error reappears contact your supplier.
Reset the controller.
If the error reappears, contact your supplier.
•
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.
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.
•
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.
Installation, Maintenance and Service part
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