WMF Perfect Ultra Manual Del Usuario página 29

Cause
Diameter of the hob is unsuitable.
Inappropriate heat level
Lid incorrectly positioned.
The ball in the safety valve (4) is not positioned
correctly.
Inadequate liquid (at least 1/4 l).
Sealing ring (10) and/or pot edge are not clean.
Rotary knob (8) is not set to heat setting 1 or 2.
Sealing ring (10) is damaged or hard
(due to wear).
The cooking indicator seal (2) or the seal of the
residual pressure safety device (13) are not
correctly seated or damaged.
If there is a problem, always remove the
pressure cooker from the hob.
Never use force to open!
Rectification
Select hob which is suitable for the pot diameter.
Set to the highest heat level.
Fully depressurise the pot, open the lid. Check
that the sealing ring (10) is positioned properly
and close the pot again.
Fully depressurize the pot, open, remove handle,
check the safety valve (4) , check that the metal
ball is positioned properly in the lid (E) and (F)
close the pot again.
Fully depressurise the pot, open the lid.
Add liquid and close the pot again.
Fully depressurise the pot, open the lid. Clean
sealing ring (10) and pot edge and close the pot
again.
Set rotary knob (8) to heat settings 1 or 2
(30c)/(30d).
Replace sealing ring (10) by an original WMF
sealing ring.
Correct the seating of the seals or replace by
original WMF spare parts.
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