76
MYDENS
COSMOGAS
8 - MAINTENANCE
8.2.4 - Checking the condition of the
safety and control devices
1. - Check any interventions of the safety and control
devices by consulting the appliance diagnostics
(details "1", "18" and "24" of Figure 1 et detail "35" of
Figure 2);
2. - Visually check that the safety valve does not have any
signs of corrosion, physical damage, water marks or
signs of rust;
3. - In case of other damage indicated above proceed with
replacing the component;
8.2.5 - Checking the condition of the
electrical system
1. - Access the internal components (section 8.3);
2. - Visually check that the cables are correctly housed
in the relative cable glands, and that the plug-in
connections are fixed correctly and do not show signs
of blackening or burns;
3. - In case of damage as indicated above, replace the
damaged cables;
8.2.6 - Checking the operation of the
main switch
1. - Check that the appliance is switched off when the main
switch is set to OFF and vice versa that the appliance
is switched on when it is turned ON;
2. - In case of a malfunction, replace the switch;
8.2.7 - Checking the correspondence
of the adjusted temperatures in the
heating and domestic hot water
systems
1. - Check the correspondence between the real and set
temperatures in heating mode and in DHW mode;
2. - If the temperatures do not correspond, replace the
interested sensor, if the problem persists, replace the
control board;
8.2.8 - Checking if the device is
triggered in case of gas failure
1. - Check that after attempts to start the appliance, with
the gas shut-off valve closed, the appliance goes into
lockout mode and the
Loc 1
message appears on
the display;
2. - If the lock message does not appear, replace the
control board;
8.2.9 - Checking the condition of the air
intake and flue exhaust ducts
1. - Check that the air intake and flue exhaust ducts are not
obstructed, and show no signs of corrosion, physical
damage, water marks or signs of rust;
2. - In case of other damage indicated above proceed with
replacing the component;
3. - Make sure the externally assembled intake grids and
flue exhaust terminals do not have any residue and
are clean;
8.2.10 - Checking the ignition and
detection electrodes
1. - Access the internal components (section 8.3);
2. - Remove the burner fan unit (section 8.4);
3. - Clean any material build-up from the electrodes forming
during operations;
4. - Check the correct position of the electrodes (section
8.6);
5. - Restore the state of the appliance by reassembling
everything in the reverse order to that used for the
dismantling phases;
8.2.11 - Checking the condition of the
air vent valves
1. - Visually check that the safety valve does not have any
obstructions in the drain pipe;
2. - In case of obstructions in the drain ducts proceed with
cleaning the pipe;
3. - Visually check that the safety valve does not have any
signs of corrosion, physical damage, water marks or
signs of rust;
4. - In case of other damage indicated above proceed with
replacing the component;