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Fig.82
Negative (-) side of the air pressure
differential switch
A
(-)
2
11
(+)
13
X mbar
9.4
Finalising work
9.5
Disposal and recycling
Fig.83
MW-3000179-03
7837114 - v.01 - 10012023
10. Remove the syringe hose from the + side of the air pressure
differential switch and reconnect the original hose.
11. Connect the - side (A2) of the air pressure differential switch the hose
coming from the T piece.
12. Pull out the syringe very slowly until error code E.04.08 appears on
the display.
13. Check the pressure indicated by the pressure gauge at that point. This
is the switch pressure.
A switch pressure between -5.5 and -6.5 mbar is good. A lower or
higher switch pressure indicates a problem with the air pressure
differential switch.
10
12
AD-3002455-01
1. Fit all removed parts in the reverse order, but do not close the casing
yet.
Caution
During inspection and maintenance operations, always replace all
gaskets on the parts removed.
2. Fill the trap with water.
3. Put the trap back in place.
4. Carefully open all system and supply valves which were closed to
carry out the maintenance.
5. Fill the central heating system with water if necessary.
6. Vent the central heating system.
7. Top up with more water if necessary.
8. Check the tightness of the gas and water connections.
9. Put the boiler back into operation.
10. Carry out an auto-detect when a control board has been replaced or
removed from the boiler.
11. Set the boiler to full load and carry out a gas leak detection and a
thorough visual check.
12. Set the boiler to normal operation.
13. Close the casing.
Caution
Only qualified professionals are permitted to remove and dispose
of the boiler, in accordance with local and national regulations.
If you need to remove the boiler, proceed as follows:
1. Switch off the boiler.
2. Cut the power supply to the boiler.
3. Close the main gas valve.
4. Close the water mains.
5. Close the gas valve on the boiler.
6. Drain the installation.
7. Remove the air/flue gas pipes.
8. Disconnect all pipes.
9. Dismantle the boiler.
9 Maintenance
55
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