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48
MYDENS 60
COSMOGAS
7 - USE
7.19.1 - Diagnostics: blocks “Loc”
Block
Description of block
Checks
Solutions
Loc 0
Internal memory error
E2prom at command
board
Replace the command and control board.
Loc 1
No flame detection after
three successive ignition
attempts.
Control: Supply gas pressure (see chapter 6.6),
sparks on the ignition electrodes (see chapter
8.5);correct combustion agent air pressure (see
chapter 6.7); 220 Vac 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 60 (follow the procedure in
chapter 8.15)
If the supply pressure is not correct, operate
upstream from the appliance to restore it; if the
pressure of the combustion agent air is not correct,
operate on the air intake/fumes exhaust circuit to
eliminate any obstructions. 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 60, the CO2
must be checked (follow chapter 6.8) 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
Ceck the appliance main ground.
Replace the command and control board.
Loc 4
Boiler 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
Control it is powered at 300 Vdc.
If the fan is powered, it must be replaced, differently
replace the board.
Loc 6
Software error inside the
command board
Replace the command and control board.
Loc 7
Content of the memo-
ry E2prom inside the
command board, not
updated
Replace the command and control board.
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
Not applicable
Loc 12
Not applicable
Loc 13
The boiler has reached
95°C
Control that the pump functions.
Restore water circulation or replace the command
and control board.
Loc 14
Fumes maximum tempe-
rature.
Check there is no air in the central heating circuit;
bleed the highest radiators;
Check the circulation pump operates correctly;
Measure boiler efficiency; it must correspond to that
declared in the technical features..
Bleed the air from the boiler and from the highest
central heating elements with respect to the boiler.
If the pump does not operate, it must be replaced.
If the efficiency does not correspond to the data at the
end of the manual, probably the primary heat exchan-
ger is dirty from the fumes side or the water side.
Clean and check efficiency again.
Loc 15
Software error inside the
command board
Replace the command and control board.
Loc 16
Software error inside the
command board
Replace the command and control board.
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