ENGLISH
GB
69
9.5 - Expansion Vessel
See paragraph 1.2 for the operations to check and adjust the air pressure
in the expansion vessel and to replace it if it is broken.
To access the valve of the expansion vessel, proceed as follows:
1. remove the access door to the special maintenance compartment
(Fig.1 Face F) disengaging the 2 fixing screws with the accessory
tool. It is advisable not to remove the screws completely, so that you
can used them to extract the door. Take care not to drop the screws
inside the system once you have removed the door (fig. 23);
2. slip the rubber cap off the valve or the expansion vessel (fig. 23);
3. regulate the valve as indicated in paragraph 1.2 (fig. 23);
4. reposition the rubber cap (fig. 23);
5. reposition the door and tighten the 2 screws (fig. 23).
10 - TROUBLESHOOTING
Before starting to look for faults it is necessary to disconnect the
power supply to the pump (take the plug out of the socket).
Figura 23
Solving typical problemsi
Fault
LED
Probable Causes
Remedies
The pump
does not
start.
Red: off
White: off
Blue: off
No electric power.
Check whether there is voltage in
the socket and insert the plug again.
The pump
does not
start.
Red: on
White: on
Blue: off
Shaft blocked.
See paragraph 9.4 (motor shaft
maintenance).
The pump
does not
start.
Red: off
White: on
Blue: off
Utility at a level higher
than the system
restarting pressure
level (par. 3.2).
Increase the system restarting
pressure level by increasing SP or
decreasing RP.
The pump
does not
stop.
Red: off
White: on
Blue: off
1. Leak in the
system.
2. Impeller or hydrau
-
lic part clogged.
3. Air getting into the
suction pipe.
4. Faulty flow sensor
1. Check the system, find and
eliminate the leak.
2. Dismantle the system and
remove the obstructions (assis
-
tance service).
3. Check the suction pipe, find
and eliminate the cause of air
getting in.
4. Contact the assistance centre.
