
51
1181
1186
1187
Repair instructions
Limescale can block the holes in the valve
diaphragm and interfere with the function of the
valve.
It is therefore advisable to dismantle and clean
the valve at certain regular intervals. The
frequency depends on operating conditions and
the level of contamination in the water.
If the valve does not open
•
Check that power is supplied to the coil.
•
Check the coil with an instrument to determine
whether there is a break or a short circuit.
•
Dismantle the valve (see below) and check
the openings in the valve diaphragm.
•
Check the inlet strainer and clean as required.
•
Undo the coil and clean the surfaces of the
magnetic core.
If the valve does not close
•
Check that the coil is not live. The valve is
normally closed when the magnet is not
energized.
•
Check the return spring.
•
Check the diaphragm (pilot pressure opening).
Dismantling the valve
•
Pull the coil straight upwards. Use a
screwdriver if necessary to carefully undo the
coil.
•
Use the tool supplied (attached to one of the
hoses when the machine is delivered) to open
the valve housing. Slide the tool over the
protruding plastic sleeve to that the pegs on
the tool engage the corresponding sockets in
the valve housing.
•
Use a spanner or a pair of pliers and unscrew
the upper part of the valve housing.
75
Fig.
76
Fig.
77
Mechanical and electrical design
76
77
Fig.
75