64
MYDENS
COSMOGAS
7 - USE
7.17.1 - Diagnostics: locks “Loc”
Once the type of “Loc” has been displayed and the
appropriate checks and solutions have been found and
carried out, reset the appliance by pressing and holding
the RESET button (detail “B” in figure 51) until the “rSt”
message is displayed.
Lock
Lock description
Checks
Solutions
Loc 0 Internal memory error E2prom at control
board
Replace the control board.
Loc 1 No flame detection after three successive
ignition attempts
Check supply gas pressure (see section
6.6).
If the supply pressure is not correct, adjust
the components before the appliance to
restore the correct value.
Sparks on the ignition electrodes.
Restore the correct positioning the ignition
and detection electrodes (see section 8.6).
230 VAC electric power supply to the gas
valve.
If the current at the gas valve is not 230
VAC, replace the control board;
Check if the burner comes on and goes off at
the end of the
ignition attempt, that the ionisation current is
above 4 (see section 8.22).
If the ionisation current is not over 4, check
the CO2 (see section 6.7) and restore it to
the correct value.
Check the ionisation spark plug and replace
it if necessary.
Check the integrity of the ionisation current
electric circuit cables.
Loc 2 Gas valve command relay broken
Replace the control board.
Loc 3 The appliance has reached the maximum
intervention temperature
Check that the pump works.
Restore the water circulation or replace the
control board;
Check that the electrical resistance of the
two sensors (detail "35" of Figure 2) matches
the graph in section 8.24.
If either or both of the sensors are not within
the correct values, replace them;
Check that the high limit flue gas
temperature fuse (detail "18" of Figure 1) has
not been triggered.
If the flue gas temperature fuse has been
triggered (the contact is open), before
replacing it, carefully check the appliance
efficiency as detailed in section 8.23;
WARNING!!! If the efficiency is not within
the specified limits DO NOT ATTEMPT
TO RESET THEM, but contact the
manufacturer.
Loc 4 Appliance in error mode for more than 20
hours
Check the last error displayed on the board
at the parameter 1052.
Respond according to the last error
displayed.
Loc 5 Fan stopped for morethan 60 seconds
Check it is powered at 230 Vdc.
If the fan is powered, it must be replaced.
Otherwise, replace the control board.
Loc 6 Fan too slow for more than 60 seconds
Check it is powered at 230 Vdc.
If the fan is powered, it must be replaced.
Otherwise, replace the control board.
Loc 7 Fan too fast for more than 60 seconds
Check it is powered at 230 Vdc.
If the fan is powered, it must be replaced.
Otherwise, replace the control board.
Loc 8 Software error on the control board
Replace the control board.
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