31
Mechanical and electrical design
53
1181
51
1186
52
1187
Repair instructions
Limescale can block the hole in the valve diaph-
ragm and interfere with the function of the valve.
It is therefore advisable to dismantle and clean
the valve at certain regular intervals. The fre-
quency 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
energised.
• Check the return spring
• Check the diaphragm (pilot pressure opening).
Dismantling the valve
• Pull the coil straight upwards. Use a screwdri-
ver 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.
Fig.
51
Fig.
52
Fig.
53
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