Cleaning the D.H.W heat exchanger
(see fig. 1)
• Close the shut-off valve and drain the domestic hot
water circuit and central heating circuit of the water
heater;
• Disconnect the joints securing the heat exchanger to
the pipes;
• Unscrew the screws joining heat exchanger fixing
bracket to its support and remove it;
• Remove the heat exchanger;
• De-scale the heat exchanger by chemically washing
the plates;
• Fit new washers;
• Re-assemble the heat exchanger and components
following the above procedure in reverse order;
• Fill the system with water and check for any leaks from
the joints.
Part replacement:
Ignition and/or flame ionization electrodes
(see fig. 2)
• Un-Plug the electrode wires;
• Slacken the fixing screws;
• Remove the electrodes. When fitting the new ones,
check that the seals are not damaged. Replace if
necessary;
• Reconnect the wires and re-assemble the components
following the above procedure in reverse order;
• Switch on the power supply and restart the appliance;
If the water heater does not restart, check the
positions of the electrodes (especially the ignition
electrode). Make sure that original position and
distances between the electrodes and the burner are
respected to avoid a water heater malfunction).
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