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Indication Cause Measure
CO
2
value (at full load)
is not correct
The unit is not set for the correct gas
type
Make sure that the gas type corresponds
with the information on the rating plate
Make sure if the venturi restrictor has the
correct diameter, refer to Gas details (see
section 13.3).
Contaminated venturi Remove any contamination from the venturi
inlet.
Leakage between venturi and flexible
venturi connector
Make sure that the flexible venturi
connector is not damaged.
If necessary replace the flexible venturi
connector
Make sure that the flexible venturi
connector is correctly connected.
If necessary, tighten the clamp.
Recirculation of flue gases Make sure that the CO
2
-value measured
in the flue gas outlet is correct, refer to
CO
2
value (see section 8.9.4).
Make sure that the CO
2
value measured
in the air inlet is below 0.5 vol%.
If necessary, reconnect the venting
system and change the necessary seals.
12.1.2 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.
Code and description Cause Measure
C02 (lock out error)
Control error
Error message from the
controller
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
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.
C03 (blocking error)
Control error
More then 7 resets detected in a short
period.
Wait for the error to disappear (maximal 1
hour).
If the error does not disappear, replace the
controller
C04 (blocking error)
Control error
This error appears when the controller
and/or display is replaced.
Incorrect selection of the water heater.
Turn the water heater OFF and ON. When
the error reappears contact your supplier.
n
0312266_INNOVO_UKUK_V3.0, 2017-02-10 73
73


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