49
AGUADENS
COSMOGAS
7.9.1 - Diagnostics “Loc” block fault codes
and potential solution
7 - USE
Block
Block Description
Checks
Solutions
Loc 0
Internal memory error
E2prom at command
board
Replace the command and control board.
Loc 1
1 No flame detection after
three successive ignition
attempts.
Control: Supply gas pressure (see section 6.6),
sparks on the ignition electrodes (see section 8.6);
230Vac electric power supply to the gas valve;
electric resistance of the two gas valve coils of 0,88
Kohm and 6,59 Kohm
If the burner switches on and switches off at the end
of the ignition attempt, check: that the ionisation
current is at a value over 4 (follow the procedure in
section 8.13)
the supply pressure is not correct, operate upstream
from the appliance to restore it; If the current at the
gas valve is not 230Vac, the command and control
board must be replaced. If the electric resistance of
the gas valve is not 0,88 Kohm and 6,59 Kohm, the
valve must be replaced.
If the ionisation current is not over 4, the CO2 must
be checked (follow section 6.7) and restore its
correct value, check the ionisation electrode and
replace it if necessary. Check the integrity of the
ionisation current electric circuit cables.
Loc 2
Gas valve command relay
broken
Replace the command and control board.
Loc 3
Internal safety relay
failure at command board
Replace the command and control board.
Loc 4
Appliance in error mode
for more than 20 hours
Control the last error displayed in the board.
Operate according to the last error displayed.
Loc 5
Fan out of speed for
more than 60 seconds
Check that it is powered at 300 Vdc.
If the fan is powered, it must be replaced, alternatively
replace the command and control board.
Loc 6
Fan error too slow
Loc 7
Fan error too fast
Loc 8
Parameters inside
the E2prom memory,
incorrect
Replace the command and control board.
Loc 9
Software error inside the
command board
Replace the command and control board.
Loc 10
Software error inside the
command board
Replace the command and control board.
Loc 11
Software error inside the
command board
Replace the command and control board.
Loc 12
Software error inside the
command board
Replace the command and control board.
Loc 13
Not applicable
(N/A)
(N/A)
Loc 14
Not applicable
(N/A)
(N/A)
Loc 15
Appliance has reached
the maximum temperatu
-
re of operation
Check that the pump works;
Check that the electrical resistance of the two sensors
1001 and 1005 combine with the chart referred to in
section 8.14;
Check that the high limit flue gas temperature fuse has
not been involved;
Check air is purged from water heater (see section 6.5);
Restore the flow of water or
replace the control board;
If either or both of the sensors are not within correct
values, replace sensor;
If the high limit flue gas temperature fuse has been
involved (the contact is open) before replacing the high
limit verify the temperature of the flue gas referred to
in the technical data from section 9;
CAUTION!!! If the temperature is not within the
correct value DO NOT ATTEMPT ANY REPAIR but
contact the manufacturer.
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