Sorry for delay. This is what happens with water being pumped in to the dispenser area:-
Position 1: Water in on RHS Under pressure
Position2: Water in on RHS Under Pressure
Position 3: Nothing
Position 4 : Nothing
Position 5: Water in centre but only slowly. Not much pressure
THEN Centre under pressure
Position 6 :Water on RHS under pressure
Position 7 :Water on RHS under pressure
On First Trial
Position 8: Water on RHS under pressure
Position 9: Water on RHS under pressure
Position 10:Water on Centre under pressure
Position 11: Water on centre under pressure
Position 8,9,10,11,12 NOTHING
As you can see it appears that no water is pumped in to LHS.
Also it appears that the programmer might not be working correctly from 8 onwards.
I suspect that the programmer electronics are US. On one earlier occasion some water was pumped in to LHS.
Sorry about confusion.
How much is the circuit board/ electronics and or timer if that is what you may now think it is&
How easy are they to fit?
Does it need an expert to change them?
If it is a DIY job how can a householder do it.